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Under $20 Heat Detectors

Shop the best prices on 41 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 41
Wcs1600 Hall Current Sensor Adjustable Dc100a Short Over-current Detector Protection Module
$11.95
Tuya Zigbee Water Leak Sensor Wireless Flooding Detector Water Leakage Detection Alert Water Level
$14.95 Save $14.00 RRP: $28.95
Tuya Zigbee Water Leak Sensor Wireless Flooding Detector Water Leakage Detection Alert Water Level
$20.95 Save $1.00 RRP: $21.95
4098-9613 - Fixed Temperature 135F Rate of Rise Heat Detector 2025
$20.95 Save $21.00 RRP: $41.95
4098-9613 - Fixed Temperature 135F Rate of Rise Heat Detector
$0.95
Wcs1700 Hall Current Sensor Adjustable Dc70a Short Over-current Detector Protection Module
$11.95
Portable Infrared Multi-function Detector 3-speed Digital Anti-candid Camera Scanner
$21.95 Save $37.05 RRP: $59.00
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
5 Pcs DC 3-24V 85dB Sound Electronic Buzzer Alarm Black 23 x 12mm
$8.95
DEWIN Water Leak Alarm,Water Overflow Sensor Detector 120dB Water Leakage Alarm System
$19.95 Save $18.00 RRP: $37.95
TICFOX Water Overflow Sensor Detector 120dB Water Leakage Alarm System
$19.95 Save $18.00 RRP: $37.95
5 Pcs Dc 3-24v 85db Sound Electronic Buzzer Alarm Black 23 X 12mm Elriven
$9.95 Save $37.00 RRP: $46.95
5 Pcs Dc 3-24v 85db Sound Electronic Buzzer Alarm Black 23 X 12mm
$18.95
Detector Cover Plastic Cover for Baking and Cooking
$17.95 Save $15.00 RRP: $32.95
WCS1600 Hall Current Sensor Adjustable DC100A Short Over-Current Detector Protection Module
$21.95
Sunglasses Rimless Wave Glasses Fire Shape Glasses Eyewear For Party Elsavct
$19.95 Save $79.05 RRP: $99.00
Tuya Zigbee Water Leak Sensor Wireless Flooding Detector Water Leakage Detection Alert Water Level
$18.95 Save $40.05 RRP: $59.00
Universal Valve Extension Adapter 135 Degrees for Motorcycle and Car, 45-90 Degree Angle, Regulated Tire Valves for Tire Inflation
$20.95 Save $11.00 RRP: $31.95
Water Overflow Sensor Detector 120dB Water Leakage Alarm System
$21.95 Save $18.00 RRP: $39.95
Infrared Fire Detection Sensor Module Flame Sensing Relay Module 12VDC 760~1100nm
$7.95 Save $9.00 RRP: $16.95
5 Pcs Dc 3-24v 85db Sound Electronic Buzzer Alarm Black 23 X 12mm XYT
$16.95 Save $9.00 RRP: $25.95
Vd806 Non-contact Electrical Voltage Detector With Battery Continuity Tester Pen With Sound And Light Alarm Elsavct
$10.95 Save $63.05 RRP: $74.00
5 Pcs DC 3-24V 85dB Sound Electronic Buzzer Alarm Black 23 x 12mm
$7.95 Save $39.00 RRP: $46.95
5 Pcs Dc 3-24v 85db Sound Electronic Buzzer Alarm Black 23 X 12mm
$13.95 Save $6.00 RRP: $19.95
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
WCS1800 3-5V Hall Current Sensor Adjustable DC100A 70A 35A Short over-Current Detector Protection M
$15.95
StepUp Module 12V to 36V DC Voltage Converter Power Regulator Booster GYVRM SZS12361.5
$16.95 Save $17.00 RRP: $33.95
Fuel Valve Switch 62163 75 Shockproof High Temperatures Resistant Lightweight Replacement for Big Twin 1975?2006
$20.95 Save $13.00 RRP: $33.95
WCS1600 3-5V Hall Current Sensor Adjustable DC100A 70A 35A Short over-Current Detector Protection M
$15.95
Multifunctional Rechargeable Intelligent Sensor Adjustable Headlamp
$14.95 Save $17.00 RRP: $31.95
5 Pcs DC 3-24V 85dB Sound Electronic Buzzer Alarm Black 23 x 12mm
$8.95 Save $6.00 RRP: $14.95
5 Pcs Dc 3-24v 85db Sound Electronic Buzzer Alarm Black 23 X 12mm
$16.95 Save $9.00 RRP: $25.95