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Under $20 Heat Detectors

Shop the best prices on 28 great value under $20 heat detectors. Shopping for heat detectors is easy with Fruugo, with SALE discounts, offers and savings on Elriven and Elsavct. Buy heat detectors online safely with Fruugo, with secure payment and fast shipping to Australia.

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1 - 28 of 28
Wcs1600 Hall Current Sensor Adjustable Dc100a Short Over-current Detector Protection Module
$12.95
Tuya Zigbee Water Leak Sensor Wireless Flooding Detector Water Leakage Detection Alert Water Level
$15.95 Save $16.00 RRP: $31.95
5 Pcs DC 3-24V 85dB Sound Electronic Buzzer Alarm Black 23 x 12mm
$8.95 Save $5.00 RRP: $13.95
4098-9613 - Fixed Temperature 135F Rate of Rise Heat Detector
$0.95
5 Way Flame Sensor Module Fire Extinguisher Detection Board with Indicator Digital and Analog Output for Safety Systems
$8.95 Save $4.00 RRP: $12.95
Tuya Zigbee Water Leak Sensor Wireless Flooding Detector Water Leakage Detection Alert Water Level
$21.95
DEWIN Water Leak Alarm,Water Overflow Sensor Detector 120dB Water Leakage Alarm System
$21.95 Save $21.00 RRP: $42.95
TICFOX Water Overflow Sensor Detector 120dB Water Leakage Alarm System
$21.95 Save $21.00 RRP: $42.95
CO sensor detector safety device for home and boat
$19.95
5 Pcs Dc 3-24v 85db Sound Electronic Buzzer Alarm Black 23 X 12mm Elriven
$9.95 Save $40.00 RRP: $49.95
5 Pcs Dc 3-24v 85db Sound Electronic Buzzer Alarm Black 23 X 12mm
$20.95
Detector Cover Plastic Cover for Baking and Cooking
$20.95 Save $16.00 RRP: $36.95
Tuya Zigbee Water Leak Sensor Wireless Flooding Detector Water Leakage Detection Alert Water Level
$19.95 Save $44.05 RRP: $64.00
Infrared Fire Detection Sensor Module Flame Sensing Relay Module 12VDC 760~1100nm
$8.95 Save $10.00 RRP: $18.95
Vd806 Non-contact Electrical Voltage Detector With Battery Continuity Tester Pen With Sound And Light Alarm Elsavct
$11.95 Save $67.05 RRP: $79.00
5 Pcs DC 3-24V 85dB Sound Electronic Buzzer Alarm Black 23 x 12mm
$8.95 Save $41.00 RRP: $49.95
5 Pcs Dc 3-24v 85db Sound Electronic Buzzer Alarm Black 23 X 12mm
$14.95 Save $8.00 RRP: $22.95
Electrical Tester, 12-1000v Non-contact Voltage Detector, Phase/neutral Wire Test, Sound & Light Buzzer, Flashlight, Ac 50-500hz, Ncv Voltage Tester P
$19.95 Save $28.00 RRP: $47.95
WCS1800 3-5V Hall Current Sensor Adjustable DC100A 70A 35A Short over-Current Detector Protection M
$16.95
StepUp Module 12V to 36V DC Voltage Converter Power Regulator Booster GYVRM SZS12361.5
$18.95 Save $19.00 RRP: $37.95
WCS1600 3-5V Hall Current Sensor Adjustable DC100A 70A 35A Short over-Current Detector Protection M
$17.95
Multifunctional Rechargeable Intelligent Sensor Adjustable Headlamp
$16.95 Save $19.00 RRP: $35.95
5 Pcs DC 3-24V 85dB Sound Electronic Buzzer Alarm Black 23 x 12mm
$8.95 Save $6.00 RRP: $14.95
WCS1700 3-5V Hall Current Sensor Adjustable DC100A 70A 35A Short over-Current Detector Protection M
$17.95
Flame Detection Sensor Photosensitive Electric Eye Photoresistor for Burner Applications
$14.95 Save $16.00 RRP: $30.95
Freestanding Heat Detection Alarm ABS High Temperature Detector with Audible Visual Warning for Fire Safety
$20.95 Save $10.00 RRP: $30.95
Camera Detector 25H Working Time Detection Signal Scanner for Home Car Hotel
$18.95 Save $7.00 RRP: $25.95
StepUp Module 12V to 36V DC Voltage Converter Power Regulator Booster GYVRM SZS12361.5
$16.95 Save $21.00 RRP: $37.95