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Under $20 Heat Detectors

Shop the best prices on 38 great value under $20 heat detectors. Shopping for heat detectors is easy with Fruugo, with SALE discounts, offers and savings on Elsavct and Elriven. Buy heat detectors online safely with Fruugo, with secure payment and fast shipping to Singapore.

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1 - 32 of 38
Multifunctional Rechargeable Intelligent Sensor Adjustable Headlamp
$14.95 Save $17.00 RRP: $31.95
Digital Lcd Hygrometer Wood Moisture Meter Firewood Electrode Detector 0-99.9%
$19.95
26-27 4098-9613 - Fixed Temperature 135F Rate of Rise Heat Detector
$20.95 Save $20.00 RRP: $40.95
Smart WIFI Water Leak Detector 100dB High-Decibel Alarm Remote Real-Time Control Wireless Stereo Se
$20.95 Save $4.00 RRP: $24.95
WCS1700 3-5V Hall Current Sensor Adjustable DC100A 70A 35A Short over-Current Detector Protection M
$15.95
Camera Detector 25H Working Time Detection Signal Scanner for Home Car Hotel
$16.95 Save $6.00 RRP: $22.95
StepUp Module 12V to 36V DC Voltage Converter Power Regulator Booster GYVRM SZS12361.5
$13.95 Save $19.00 RRP: $32.95
Flame Detection Sensor Photosensitive Electric Eye Photoresistor for Burner Applications
$12.95 Save $14.00 RRP: $26.95
5 Pcs DC 3-24V 85dB Sound Electronic Buzzer Alarm Black 23 x 12mm
$8.95 Save $5.00 RRP: $13.95
Freestanding Heat Detection Alarm ABS High Temperature Detector with Audible Visual Warning for Fire Safety
$19.95 Save $9.00 RRP: $28.95
Tuya Zigbee Water Leak Sensor Wireless Flooding Detector Water Leakage Detection Alert Water Level
$18.95
4098-9613 - Fixed Temperature 135F Rate of Rise Heat Detector 2025
$20.95 Save $21.00 RRP: $41.95
Tuya Zigbee Water Leak Sensor Wireless Flooding Detector Water Leakage Detection Alert Water Level
$14.95 Save $14.00 RRP: $28.95
Sensor Protective Case for Temperature Sensor Alarm with Easy Installation
$19.95 Save $4.00 RRP: $23.95
Wcs1600 Hall Current Sensor Adjustable Dc100a Short Over-current Detector Protection Module
$10.95
DEWIN Water Leak Alarm,Water Overflow Sensor Detector 120dB Water Leakage Alarm System
$19.95 Save $18.00 RRP: $37.95
5 Way Flame Sensor Module Fire Extinguisher Detection Board with Indicator Digital and Analog Output for Safety Systems
$7.95 Save $4.00 RRP: $11.95
Tuya Zigbee Water Leak Sensor Wireless Flooding Detector Water Leakage Detection Alert Water Level
$19.95 Save $2.00 RRP: $21.95
4098-9613 - Fixed Temperature 135F Rate of Rise Heat Detector 2025
$20.95 Save $20.00 RRP: $40.95
Portable Infrared Multi-function Detector 3-speed Digital Anti-candid Camera Scanner
$20.95 Save $38.05 RRP: $59.00
Water Overflow Sensor Detector 120dB Water Leakage Alarm System
$21.95 Save $18.00 RRP: $39.95
WCS1600 Hall Current Sensor Adjustable DC100A Short Over-Current Detector Protection Module
$21.95
5 Pcs DC 3-24V 85dB Sound Electronic Buzzer Alarm Black 23 x 12mm
$7.95 Save $38.00 RRP: $45.95
Tuya Zigbee Water Leak Sensor Wireless Flooding Detector Water Leakage Detection Alert Water Level
$17.95 Save $41.05 RRP: $59.00
WCS1600 3-5V Hall Current Sensor Adjustable DC100A 70A 35A Short over-Current Detector Protection M
$15.95
WCS1800 3-5V Hall Current Sensor Adjustable DC100A 70A 35A Short over-Current Detector Protection M
$14.95
Fuel Valve Switch 62163 75 Shockproof High Temperatures Resistant Lightweight Replacement for Big Twin 1975?2006
$20.95 Save $12.00 RRP: $32.95
Electrical Tester, 12-1000v Non-contact Voltage Detector, Phase/neutral Wire Test, Sound & Light Buzzer, Flashlight, Ac 50-500hz, Ncv Voltage Tester P
$16.95 Save $25.00 RRP: $41.95
StepUp Module 12V to 36V DC Voltage Converter Power Regulator Booster GYVRM SZS12361.5
$16.95 Save $16.00 RRP: $32.95
Universal Valve Extension Adapter 135 Degrees for Motorcycle and Car, 45-90 Degree Angle, Regulated Tire Valves for Tire Inflation
$20.95 Save $10.00 RRP: $30.95
5 Pcs Dc 3-24v 85db Sound Electronic Buzzer Alarm Black 23 X 12mm
$12.95 Save $7.00 RRP: $19.95
TICFOX Water Overflow Sensor Detector 120dB Water Leakage Alarm System
$19.95 Save $18.00 RRP: $37.95