4-in-1 Gas & CO Detector Price Compare

RV Carbon Monoxide & Propane Detectors, Replacement for Old RV Carbon Monoxide Detector #31011, 2 in 1 Dual CO/Gas Alarm with Digital Display and Screwdriver, Hardwired - VDC 12V, Flush Mount

$7.00 Buy on Amazon

4-in-1 Portable Carbon Monoxide Detectors Plug in - Natural Gas Leak Detector, Propane & CO Alarm with Dual Sensor, Temp & Humidity Display for Home, RV, Travel, Apartment, 2Pcs

$9.00 Buy on Amazon

Professional Gas Leak Detector, Portable Digital Display, Black and Orange, Handheld Safety Testing Tool with Power Button and Function Controls,AAA*2

$5.00 Buy on Amazon

PT520A Natural Gas Detector, Gas Leak Detector with 17-Inch Gooseneck, Locating The Source Like Propane, Methane, and Butane for Home and RV (Includes Battery x3) - Orange

$6.00 Buy on Amazon

Propane Leak Detector | 20-Year Sensor Life | Nano-Oxide Sensor | Sewer Gas Leak, Natural Gas, Methane, Combustibles |

$6.00 Buy on Amazon

ENERLITES Low Voltage Ceiling Sensor Pir Occupancy Motion Detector, 360° Field of View, 1200 Sq Ft Coverage, Commercial/Industrial Grade, MPC-50L, White

$4.00 Buy on Amazon

Promtex 4 in 1 Portable Carbon Monoxide Dioxide Detector, Rechargeable CO CO2 Monitor Meter Air Quality Monitor with Magnetic & Lanyard for Home, Travel, RV, Camping with Temp/Humidity Sensor

$6.00 Buy on Amazon

X-Sense 2-in-1 Smoke and Carbon Monoxide Detector Alarm (Not Hardwired), 10-Year Battery-Operated Dual Sensor Fire & CO Alarm, UL 217 & UL 2034 Certified, SC06, 1-Pack

$6.00 Buy on Amazon

Plug-in Natural and Propane Gas Detector 4-in-1; VITITE Digital Gas Alarm for Home, RV, and Kitchen; 24/7 Gas Monitor Sensor for LPG, LNG, Methane, Butane

$4.00 Buy on Amazon

Photoelectric Smoke Detector with 9V Battery Included Smoke Alarm, 10-Year Sensor, Test/Silence Button, Low Battery Warning, Easy Mount, 1 Pack Fire Alarm for Home Bedroom Living Room

$4.00 Buy on Amazon

4-in-1 Upgraded Natural Gas Detectors,Temperature & Humidity Display,Clear LCD Screen Sound Light Dual Detector for Home RV Travel(1Pack White)

$4.00 Buy on Amazon

SITERWELL Smoke Detector, 10 Year Product Life Fire Alarm with Magnetic Fastening Kit, Smoke Alarm with Photoelectric Sensor and Low Battery Warning Function for House, UL217 Listed,GS509A,1 Pack

$3.00 Buy on Amazon

RAYZEEK DC 12/24V 10A Low Voltage Ceiling Sensor Pir Occupancy Motion Detector,360 Motion Sensor,8-12M High Sensitive Ceiling Motion Sensor Switch, Commercial/Industrial Grade, White

$3.00 Buy on Amazon

RV Carbon Monoxide and Propane Detectors, Camper CO/LP Gas Alarm, 12V DC 3 Brackets Compatible with All Other Brands with Digital Display and Screwdriver, Flush & Surface Mount

$7.00 Buy on Amazon

SITERWELL Plug in Carbon Monoxide Detector 10 Year Battery, CO Alarm Detector with Electrochemical Sensor and Sound Warning, AC Powered Portable Carbon Monoxide Detector for Home Office Travel,1-Pack

$3.00 Buy on Amazon

X-Sense Wi-Fi Water Leak Detector for Home - Smart 2-in-1 Leak & Low-Temperature Sensor with App Alerts, Protection for Homes, Kitchens & Basements, Model SWS0B, 1 Pack

$2.00 Buy on Amazon

Gas Sensor Fabrication Guide on Amazon – Affordable Deal

$11.00 Buy on Amazon

Water Leak Detector 6 Pack, 5-Year Battery Life, Water Alarm with Low Battery Warning, 100dB Loud Sound and Self-Test Function, IP66 Waterproof for Home Basement Kitchen(Not Support Wi-Fi)

$11.00 Buy on Amazon

5 Pack Black Water Leak Alarm Detector, 120dB Loud Alert Water Sensor, IP66 Waterproof, Sensitive Leak and Drip Alert, Easy Installation for Home, Basement Flood Prevention, Bathroom, Sink, Laundry

$5.00 Buy on Amazon

Wireless Motion Sensor Outlet with Timer, Plug-N-Play PIR Motion Activated Switch, Indoor Motion Detector for Lights & Exhaust Fan (110V-120V) of Bathroom, Garage, Laundry Room

$5.00 Buy on Amazon

Motion Sensor Door Chime, Wireless Motion Detector Alarm Indoor, Business Entry Alert Bell with Buzzer, Doorbell for Home/Garage Door/Store, USB/Battery Powered,1 Receiver +2 Sensors

$5.00 Buy on Amazon

SANSI Motion Sensor Outdoor Lights, 15W 2000LM LED Flood Lights Outdoor, 5000K 4 Modes Security Lights for Outside Porch Yard Garage Patio, IP65 Dusk to Dawn Motion Detector Lights

$5.00 Buy on Amazon

Winees WiFi Water Leak Detector, 3 Pack Water Sensors(Hub Not Included), Easy Set Up, 100M Transmission for Basement, Bathroom, Laundry, IFTTT, S1 FSK(Accessory)

$5.00 Buy on Amazon

Orbit 71005 B-hyve Smart Flood Sensor - WiFi Water Leak Detector (5-Pack)

$5.00 Buy on Amazon

SANSI 28W 3500LM Motion Sensor Outdoor Lights, Outdoor Motion Sensor Light Security Lights Detector with 4 Mode 350W Equiv 5000K, IP65 Waterproof for Soffit, Garage, Yard (Black) Hardwired

$5.00 Buy on Amazon

8 Pack Water Leak Detectors for Home, 100dB Waterproof Water Sensor Alarm Leak Detector for Basements, Bathrooms, Laundries, Sinks, and Windows(Battery Included)

$5.00 Buy on Amazon

WiFi Water Leak Detectors for Home 3 Pack, Wireless Smart Water Leak Sensor, 120dB Adjustable Water Sensor Alarm Leak Detector, APP Alerts, 3 Water Sensors & 1 Hub for Kitchen, Bathroom, Sink, Laundry

$5.00 Buy on Amazon

meross Matter Human Presence Sensor, 3-in-1 PIR & Light & mmWave Radar Motion Sensor, AI Motion Detector for Matter Smart Home Automation, Supports HomeKit, Alexa, Google, Home Assistant, 2.4GHz Wi-Fi

$5.00 Buy on Amazon

5 Pack Water Leak Alarm Detector, 120dB Loud Alert Water Sensor, IP66 Waterproof, Sensitive Leak and Drip Alert, Easy Installation for Home, Basement Flood Prevention, Bathroom, Sink, Laundry

$5.00 Buy on Amazon

Kidde Heat Detector, Hardwired with Battery Backup & 2 LEDs, Interconnect Capability, Ideal for Garages

$6.00 Buy on Amazon

Relaxweex 4 Pcs Recordable PIR Infrared Motion Sensor Activated Voice Motions Sensor Detector Welcome Doorbell Speaker Motion Sensors Door Chime Alarm Multiple Sounds Player for Play Speech

$4.00 Buy on Amazon

Kidde Carbon Monoxide Detector, Plug-In with 9V Battery Backup, Digital Display, 85 dB Alarm, LED Status Light Indicators, 3rd Edition

$6.00 Buy on Amazon

Franklin Sensors ProSensor M150/X990 Stud Finder with Live Wire Detection and 9-Sensors, Wood & Metal Stud Detector/Wall Scanner, Made in The USA

$6.00 Buy on Amazon

Case for Franklin Sensors ProSensor MAX/ M210/ 710/710+/ T13/ T11/ X2100/ X1100 Stud Finder, Holder for Wood Metal Stud Detector, Wall Scanner, Plaster Tile Sensing Tool Bag (Box Only)

$4.00 Buy on Amazon

SUNMAY Stud Finder Wall Scanner,7-in-1 Stud Finder for Walls, Stud Detector Beam Finder for Wood Metal AC Live Wire Studs,Joists and Pipes,HD LCD Display,Accurate Positioning

$4.00 Buy on Amazon

Smart Caregiver Wireless Motion Sensor Alarm System with Pager for Fall and Wandering Prevention | Mountable Motion Detector Alarm Alerts Medical Caregiver with Up to 300' Range | Bed or Door Movement

$4.00 Buy on Amazon

Door Alarms When Opened – 130 dB Loud Door & Window Alarm, 1.2” Wide Gap Sensor, Instant & Delay Alerts, 3 Volume Levels, AAA Batteries Included, Low Battery Alert, 2 Pack

$4.00 Buy on Amazon

Geevon 8 Pack Water Leak Detectors, 100dB Water Sensor Alarms Flood Detector for Basements, Bathrooms, Laundry Rooms, Kitchens, Garages, and Attics, Water Alarms Battery-Operated (Battery Included)

$6.00 Buy on Amazon

Qualirey 2 Pack Solar Outdoor Motion Sensor Alarm with Stake Animal Deterrent 2 x 129dB Loud Noisemaker 13 Sound Detector Strobe Light, 4 Mode Dog Barking Alarm Sensor on Ground or Fence

$6.00 Buy on Amazon

INKBIRDPLUS Portable CO2 Detector, Mini Indoor CO2 Monitor, NDIR Sensor with Full Color LCD, for Home, Office, Travel (PTH-10C)

$6.00 Buy on Amazon

CallToU Wireless Motion Sensor Alarm Indoor Motion Detector Alarm, Bed Alarms for Elderly Dementia Patients, Motion Sensor Door Chime with 500 FT Range, 5 Adjustable Volume 1 Sensor + 1 Receiver

$4.00 Buy on Amazon

Zircon MetalliScanner m40 Handheld Electronic Metal Detector

$6.00 Buy on Amazon

IS335 WIRED PIR Motion Detector, 40' x 56' by Honeywell

$4.00 Buy on Amazon

SONOFF Zigbee Human Presence Sensor, SNZB-06P Zigbee Smart Motion Detector with 5.8GHZ cmWave Radar, Requires ZigBee Bridge (1-Pack)

$4.00 Buy on Amazon

Request to Exit PIR Motion Sensor Exit Infrared Detector for Exit for Automatic Opening Door Access Control

$6.00 Buy on Amazon

Talking Products, Voice Recordable PIR Infrared Motion Sensor Detector with Multi-Track Playback. Record or Download Your own Custom MP3 Files to Play Speech, Music or Sound Effects for Halloween

$4.00 Buy on Amazon

Geevon 6 Pack Water Leak Detectors, 100dB Water Sensor Alarms Flood Detector for Basements, Bathrooms, Laundry Rooms, Kitchens, Garages, and Attics, Water Alarms Battery-Operated (Battery Included)

$4.00 Buy on Amazon

X-Sense Wi-Fi Water Leak Detector (SBS50 Base Station Required), 3 SWS0A Water Sensors

$4.00 Buy on Amazon

Kidde WiFi Water Leak Detector & Freeze Alarm, Alexa Device, Smart Leak Detector for Homes with App Alerts,White

$4.00 Buy on Amazon

Franklin Sensors ProSensor T11/X1100 Stud Finder with 11-Sensors, Wood & Metal Stud Detector/Wall Scanner for Drywall, Made in the USA

$6.00 Buy on Amazon

X-Sense Smart Water Leak Detector, Wi-Fi Water Sensor, an Accessory for SWS54 Water Sensor Kit, Single Pack, Model SWS51, 3-Pack

$4.00 Buy on Amazon

System Sensor 5600 135 Degree Fixed Temperature Rate-of-Rise, Single-Circuit Mechanical Heat Detector with Plain Housing

$4.00 Buy on Amazon

Zircon Leak Alert Water Leak Detector & Flood Sensor Alarm/Water Leak Sensor with Dual Leak Alarms 90Db Audio/Battery Powered (2 Pack) Batteries Not Included (72311) White

$4.00 Buy on Amazon

X-Sense Wi-Fi Water Leak Detector, Smart Water Sensor Alarm, Water Detector Alarm with 1700 ft Transmission Range for Kitchens, Basements, Bathrooms, 3 Water Detectors & 1 Base Station, Model SWS54

$6.00 Buy on Amazon

Kidde Smoke Detector, 10-Year Battery, Photoelectric Sensor Smoke Alarm, White

$6.00 Buy on Amazon

CPVAN 125dB Loud Motion Sensor Alarm with 328ft Remote Control (40ft PIR Detector, Batteries), Indoor Wireless Infrared Security Motion Detector with Siren for Home Garage Van (CP2 Pro, Black)

$4.00 Buy on Amazon

5 in 1 Stud Finder, Poledy Stud Detector - Precisely Locates the Center and Edge of Studs, Wall Scanner with Audio Alarm & Deep Scan Sensor for Wood, Metal Studs, Live AC Wires, Pipes & Joists

$3.00 Buy on Amazon

Radon Detector for Home Radon Testing | 20 Year Sensor Life | Large Sensitive Sensor

$7.00 Buy on Amazon

SwitchBot WiFi Water Leak Detector, Smart Water Sensor with 100dB Adjustable Alarm&App Alerts, IP67 Waterproof, Detector for Home with 3.28ft Sensing Cable, No Hub Required (Support 2.4G) (3, White)

$7.00 Buy on Amazon

EMF Detector Meter Radiation Detector for Home Digital EMF Reader for Radio Frequency Radiation 5-in-1 EMF Meter for Electromagnetic Radiation EMF Tester for Cell Phone Ghost Hunting Equipment

$7.00 Buy on Amazon

Motion Sensor Outdoor Lights - Outdoor Motion Sensor Light Battery Operated Wireless Spotlight Motion Detector Security Light Auto On Off for Sheltered Porch Stair Hallway Garage Wall Shed (2 Pack)

$3.00 Buy on Amazon

240° & 360° Replacement Motion Sensor, Adjustable Time & Detection Sensitivity Up to 70 Feet Range, 4 Working Modes Outdoor Motion Detector for Security Floodlight, White, UL Listed

$3.00 Buy on Amazon

Stud Finder Wall Scanner - 5 in 1 Electronic Stud Detector with Upgraded Smart Sensor, Audio Alarm and HD LCD Display for the Center and Edge of Wood, AC Wire, Metal and Studs Detection(Frosted Black)

$3.00 Buy on Amazon

Motion Sensor Outdoor Lights, Battery Operated Outdoor Light, 1000LM Motion Detector Lights for Outside, 6000K LED Security Light Battery Powered Spotlight for House Wall, Black(2 Pack)

$3.00 Buy on Amazon

Franklin Sensors ProSensor M70 Stud Finder with 7-Sensors, Wood & Metal Stud Detector/Wall Scanner, Made in The USA

$3.00 Buy on Amazon

ProSensor M10 Center Stud Finder/Wood and Metal Stud Detector/Wall Scanner for Drywall

$3.00 Buy on Amazon

MOCREO SW2 Water Leak Detector Sensor with 95dB Alarm, No Subscription Fee, Home Wireless Flood Monitor for Basement, Laundry, Pipe Leakage, Sink Overflow(MOCREO Hub Required)

$3.00 Buy on Amazon

18-in-1 Smart Air Quality Monitor - Indoor WiFi Air Quality Detector with Dual Chip, Real-Time for AQI, CO2, PM2.5, PM1.0, PM10, TVOC, HCHO, Time, Temperature & Humidity with APP (White-Black)

$7.00 Buy on Amazon

SONOFF SNZB-05P Zigbee Water Leak Sensor with Detection Cable for Alarm System and Smart Home Automation, Wireless Mini Flood Detector for Kitchen Bathroom Basement 1Pack

$3.00 Buy on Amazon

AC Infinity Controller Sensor Probe, Stainless Steel 20’ Waterproof Temperature Humidity Probe, Climate Detector for CLOUDLINE Airlift AIRTITAN AIRBLAZE CLOUDWAY T-Series Controllers

$3.00 Buy on Amazon

Zigbee Human Presence Sensor, Millimeter Wave Radar Motion Detector, Can Detect Stationary Person, with Home Assistant, SmartThings, Hubitat or Echo Devices with Built-in Zigbee Hub

$3.00 Buy on Amazon

HONWELL Battery Operated Motion Sensor Light Outdoor Wireless Waterproof Spotlight Motion Detector Security Light, Light Sensor Auto On Off for Porch Stair Hallway Garage Wall Shed House Door (1Piece)

$3.00 Buy on Amazon

GREENIC Radar Motion Sensor Light Bulbs Outdoor, 15W 5000K PAR38 LED Flood Light Bulb with Motion Detector and Dusk to Dawn Sensor, 100 Watt Equivalent, E26 Medium Base, 1500LM, Daylight, 2 Pack

$3.00 Buy on Amazon

AC Infinity Controller Sensor Probe for Controller AI+ Stainless Steel 20’ Temperature Humidity Climate Detector, with Water-Resistant Gasket, for CLOUDLINE AIRLIFT AIRTITAN AIRBLAZE CLOUDWAY T-Series

$3.00 Buy on Amazon

Govee WiFi Water Leak Detector 3 Packs, Leak Alert with Remotely Email/APP Push and Sound Alarm, Smart Water Sensor with 100dB Adjustable Alarm, Suit for Home and Basement

$7.00 Buy on Amazon

SwitchBot WiFi Water Leak Detector, Smart Water Sensor with 100dB Adjustable Alarm&App Alerts, IP67 Waterproof, Detector for Home with Cable, No Hub Required (Support 2.4G) (White, Pack, 1)

$3.00 Buy on Amazon

Water Leak Detector+Climate Sensor,Hygrometer Thermometer with App Notifications,Wireless 2.4G WiFi,Humidity Temperature Alarm,for Home, Basement, Kitchen,Washroom,Bedroom

$3.00 Buy on Amazon

RAYZEEK Ceiling Sensor Light Switch,360 Degree Occupancy Sensor,10A 120V Hardwired Motion Sensor,High Sensitive Motion Sensor Detector Light Switch, Neutral Wire Required, Commercial/Industrial

$3.00 Buy on Amazon

Zircon MultiScanner™ A200 Stud Finder Wall Scanner, Electronic Wood and Metal Stud Detector with WireWarning® Detection, DeepScan®, LCD Display, SpotLite® Pointer and ACT™ Technology

$7.00 Buy on Amazon

WiFi Motion Sensor, Smart PIR Motion Detector with Real-Time App Alerts, 128° Wide Angle & 8m Range, No Hub Required, Works with Smart Life/Tuya, Battery or USB Powered for Home Security Automation

$3.00 Buy on Amazon

TP-Link Tapo Smart Water Leak Detector, Requires Tapo Hub, Water Leak Sensor Wi-Fi with Rapid Dripping Detection, 90dB Adjustable Alarm, App Alerts, Compatible with Alexa and Google Home, T300

$3.00 Buy on Amazon

TECKNET 125dB Loud Indoor Motion Sensor Alarm with 328ft Remote Control (40ft PIR Detector, Batteries), Wireless Infrared Motion Sensor, Security Motion Detector with Siren for Home Garage Van

$3.00 Buy on Amazon

WiFi Sensor, Smart Motion Detector Kit with Phone App Alerts, Includes Gateway Hub, PIR Motion Sensor, Doorbell Button, Door Sensor, DIY Burglar Alarm for Home Business Apartment (Only 2.4GHz)

$3.00 Buy on Amazon

Stud Finder Wall Scanner 5 in 1 Multifunctional Upgraded Smart Wall Scanner, Stud Sensor Beam Detector with Battery for Wood Metal and AC Wire Detection, Comes with HD LCD Display and Audio Alarm

$3.00 Buy on Amazon

Wireless Motion Sensor LED Light - Motion Detector Alarm Chimes Door Sensor with 500 FT Range Security Alert Monitor System for Home, Business, Store, Office, School

$3.00 Buy on Amazon

WiFi Motion Sensor, Smart Motion Detector for Home Security, Wireless Motion Sensor App Remote Monitor, Voice Command Compatible with Alexa. 1 Pack

$2.00 Buy on Amazon

Taidacent FS IR02 FS-IR02 Optical Infrared Water Liquid Level Sensor Stainless Steel Tank Wired Water Leak Detector

$2.00 Buy on Amazon

PIR Motion Sensor Switch DC 5-24V Occupancy Sensor Switch for DIY LED Lighting, PIR Infrared Motion Sensor Detector Automatic Switch LED Strip USB Interface

$2.00 Buy on Amazon

Water Leakage Detector Sensor with 3.5mm Audio Head 5Pcs Water Level Probe Dual Metal Poles Leak Detection System

$2.00 Buy on Amazon

240-Degree Replacement Motion Detector, Adjustable Time & Detection Sensitiity Up to 60 Feet Range, 3 Working Modes Pir Motion Sensor for Security Floodlight, Brown, UL Listed

$2.00 Buy on Amazon

SwitchBot WiFi Water Sensor, Smart Water Leak Detector, 100dB Adjustable Alerts & App Alerts, IP67 Waterproof, Wireless Detector for Kitchen, Bathroom, Basement, No Hub Required (Support 2.4G)

$2.00 Buy on Amazon

Radar Motion Sensor Light Bulbs, A19 12W (100 Watt Equivalent) Daylight E26 Outdoor Auto on/Off Motion Detector Lights for Outside, Porch, Garage, Driveway, Patio,(1100LM, 2-Pack)

$2.00 Buy on Amazon

Franklin Sensors ProSensor 710+ Stud Finder with 13-Sensors, Wood & Metal Stud Detector/Wall Scanner, Built-in Bubble Level, Blue, Made in the USA

$8.00 Buy on Amazon

Ceiling Sensor PIR Occupancy Motion Detector for JC LGL LED Linear High Bay Light, 40FT Ceiling & 50FT Wall Mount Detection Diameter, Commercial Grade (White, Case, 1)

$2.00 Buy on Amazon

Wired PIR Sensor Dual Passive Infrared Motion Detector Hard Wired for Existing Home Alam System or Occupancy Sensor

$2.00 Buy on Amazon

12 Pack Water Leak Detectors for Home, 100dB Waterproof Water Sensor Alarm Leak Detector for Basements, Bathrooms, Laundries, Sinks, and Windows(Battery Included)

$8.00 Buy on Amazon

SONOFF SNZB-03P Zigbee Motion Sensor, 3-Year Battery Life, for Alert System and Automations Wireless Motion Detector, SONOFF Zigbee Bridge Required, Batteries Included (1 Pack)

$2.00 Buy on Amazon

EDISHINE Motion Sensor, 180-Degree Replacement Motion Detector for Security Floodlights, Adjustable Time & Detection Sensitivity Range Up to 60 Feet, 3 Modes Pir Motion Sensor, Brown, UL Listed

$2.00 Buy on Amazon

Geevon 2 Pack Water Leak Detectors, 100dB Water Sensor Alarms Flood Detector for Basements, Bathrooms, Laundry Rooms, Kitchens, Garages, and Attics, Water Alarms Battery-Operated (Battery Included)

$2.00 Buy on Amazon

Motion Sensor, 180-Degree Replacement Motion Detector, Adjustable Time & Detection Sensitiity Up to 60 Feet Range, 3 Working Modes Pir Motion Sensor for Security Floodlight, White, UL Listed

$2.00 Buy on Amazon

Motion Sensor, 180-Degree Replacement Motion Detector, Adjustable Time & Detection Sensitiity Up to 60 Feet Range, 3 Working Modes Pir Motion Sensor for Security Floodlight, Black, UL Listed

$2.00 Buy on Amazon

Geevon 10 Pack Water Leak Detectors, 100dB Water Sensor Alarms Flood Detector for Basements, Bathrooms, Laundry Rooms, Kitchens, Garages, and Attics, Water Alarms Battery-Operated (Battery Included)

$8.00 Buy on Amazon

HiLetgo 3pcs AM312 Mini Pyroelectric PIR Human Sensor Module PIR Infrared IR Sensor Body Manual Motion Infrared IR Detector

$1.00 Buy on Amazon

SwitchBot CO2 Detector, Air Quality Monitor Indoor, CO2 Monitor for CO2/TEMP/Humidity, Portable Carbon Dioxide Detector for Home/Car/Office/Greenhouse

$9.00 Buy on Amazon

2pcs/lot XiuMii Smart Human Presence Motion Sensor,Tuya Smart Life App Control, 24G Millimeter Radar Detector High Sensing Human Body Exists Sensor Not Compatible with Alexa

$1.00 Buy on Amazon

Sound Sensor Sound Detector Module for Arduino ESP32 ESP8266 Raspberry Pi Microcontroller Projects 3.3V 5V Compatible Adjustable Sensitivity Digital Output 2 Pieces

$1.00 Buy on Amazon

MOCREO WiFi Water Leak Detector Kit, 2000ft LoRa Long-Range, SMS App Email Alerts, Leak Severity Tracking, 105dB Adjustable Alarm, 5-Year Battery Life, 3 Smart Water Sensors for Home Basement Kitchen

$9.00 Buy on Amazon

WiFi Water Leak Detector for Home with App Notification, 1 2.4Ghz Gateway + 6 WD61 Sensor, 120dB Water Flood/Drip Alarm for Basement/Kitchen/Bathroom/Toilet/Laundry Room,Sink/Pipe/Faucet Leakage Alert

$9.00 Buy on Amazon

Indoor Air Quality Monitor 16-in-1 with CO2 Detector, PM2.5P, PM10, M1.0, HCHO & TVOC – Portable Air Quality Tester with AQI Alerts, Temperature & Humidity Meter Kit for Home Office Nursery RV

$9.00 Buy on Amazon

5-in-1 Professional Indoor Air Quality Monitor Indoor Portable CO2 Monitor | Temperature | Formaldehyde Detector | Humidity TVOC | Air Quality Tester - Confined Space Clean Air Monitor (Bright White)

$9.00 Buy on Amazon

12PCS RCWL-0516 Motion Detection Sensor, Microwave Radar Sensor, Switch Module, for Arduino ESP8266 Nodemcu Wemos, for Raspberry PI, for Human Rat Cat Detector, Detection Distance 5-7m

$1.00 Buy on Amazon

Zircon MultiScanner™ A250 Stud Finder Wall Scanner, All-in-One Wood and Metal Stud Detector with Live AC Wire Detection, 4 Scan Modes, LCD Display, SpotLite® Pointer and ACT™ Technology

$9.00 Buy on Amazon

Resideo CHW3610W8001 WiFi Water Leak Detector For Home, Smart Water Sensor Alarm and Freeze Detector, Water Detector Alarm for Basement, Bathroom, and Under Sink

$9.00 Buy on Amazon

First Alert Smoke Alarm, 10-Year Sealed Battery Dual Sensor Detector with Test & Silence Button, SM310, 1-Pack

$9.00 Buy on Amazon

Ximimark 3Pcs MQ135 MQ-135 Air Quality Sensor Hazardous Gas Detection Module for Arduino

$1.00 Buy on Amazon

Home Keyhole Infrared PIR Wireless Auto Sensor Motion Detector LED Light lamp for Kitchen Hallway Stairway Silver

$1.00 Buy on Amazon

X-Sense Radon Detector for Home, Easy to Use, Zero Lab Fees, No Installation Required, Continuous Monitoring with Clear LCD Screen

$9.00 Buy on Amazon

Motion Sensor Light Bulbs for Outdoor Indoor, 9W A19 Motion Detector Led Bulb, 60 Watt Equivalent, E26 800lm 5000K Daylight, Dusk to Dawn Motion Activated Security Lights for outside, Inside (2 Pack)

$1.00 Buy on Amazon

Water Leak Detector Sensor Alarm: Home Water Flooding Monitor Smart Sink Overflow Monitoring Adjustable Wet Moisture Alert Pipe Leakage Drip Detection Warning for Basement Floor

$1.00 Buy on Amazon

Franklin Sensors Prosensor M210 Stud Finder With 13-Sensors, Wood & Metal Stud Detector/Wall Scanner, Live Wire Detection, Made in the USA

$9.00 Buy on Amazon

GoveeLife Upgraded Smart Water Leak Detector 1s with 1804 ft Ultra-Long Range, WiFi Water Sensor with SMS/Email/APP Push and Sound Alarm,5-Year Battery Life, 5 Pack, Suit for Home, Basement, Kitchen

$9.00 Buy on Amazon

HOUND-1011S Portable Radon Detector, High-Accuracy Sensor for Home, Lightweight, Audible & Visual Alarms, Long-Term Monitoring, Easy-to-Use Radon Tester in pCi/L or Bq/m³ for Basement

$9.00 Buy on Amazon

Qualirey Solar Sound and Light Alarm Motion Sensor 129db Outdoor Security Siren Waterproof Activated Detector Driveway Alarm 6 LEDs Flash Warning Deterrent Strobe System for Home, Farm(Red,6 Pack)

$10.00 Buy on Amazon

2026 Upgraded Vehicle Exit Sensor, Automatic Gate Opener Car Detector with 50 ft Cable, Compatible with Mighty Mule,Ghost Controls, LiftMaster Vehicle Door Opening Systems

$10.00 Buy on Amazon

Metal Detector for Adults Waterproof - 2000mAh Chargeable Professional Cordless Gold Detector with LCD Display, Retractable Foldable Higher Accuracy Metal Detector with 10 IP68 Coil - OKESAM

$10.00 Buy on Amazon

Diversitech Wet Switch Flood Detector, 8 x 1.55 x 9.6 (WS-1)

$10.00 Buy on Amazon

Advanced X-ray Detector Technologies: Design and Applications

$10.00 Buy on Amazon

System Sensor 4WT-B 4-wire, photoelectric i3 smoke detector with a 135 Degree fixed thermal sensor

$10.00 Buy on Amazon

HOUND-1011 Portable Radon Detector for Home, Lightweight, High-Accuracy Sensor, 45-Day Monitoring, Easy-to-Use Radon Tester, Short- & Long-Term in pCi/L or Bq/m³ for Basement – Gray

$10.00 Buy on Amazon

3-in-1 EMF Meter Detects Electric Field (EF), Radio Frequency Field (RF), Magnetic Field (MF) - for Home EMF Detector, Office, Outdoor and Ghost Hunting, Radiation Detector Meters

$11.00 Buy on Amazon

SensorSwitch Ceiling Motion Sensor, Passive Infrared PIR Occupancy Sensor, 360° Small Motion Detection, Indoor Use, Low Voltage, Standard Range

$11.00 Buy on Amazon

Smoke Detector,Smoke Alarm for Home Replaceable Battery Powered,85dB Fire Alarm with Test/Mute Button,8 PCS

$11.00 Buy on Amazon