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Under $20 Gas Detectors

Shop the best prices on 1,080 great value under $20 gas detectors. Shopping for gas detectors is easy with Fruugo, with SALE discounts, offers and savings on Shanghai Yangxin. Buy gas detectors online safely with Fruugo, with secure payment and fast shipping to Singapore.

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1 - 32 of 1,080
Rm370 carbon monox detector - ZCL1978
$16.95 Save $47.05 RRP: $64.00
Rm370 carbon monox detector
$13.95 Save $12.00 RRP: $25.95
CO2 Air Detector Carbon Dioxide Detector Agricultural Production Greenhouse CO2 Monitor White 25-26s
$17.95 Save $17.00 RRP: $34.95
Gas Leak Detector Natural Gas Detectors Combustible Gas Detector
$13.95 Save $9.00 RRP: $22.95
5 in 1 CO2 Meter 400-5000 PPM Sensor Carbon Dioxide Detector Air Quality Monitor jy
$13.95 Save $10.00 RRP: $23.95
Air Quality Sensor Module for VOC, Formaldehyde, and ene Detection, Level 4 Monitoring Probe
$18.95 Save $11.00 RRP: $29.95
Combustible Gases Leak Detector Natural Gases Leakage Tester Combustible Gases Concentration Analyz
$19.95
12V Gas Alarm Sensor for Propane Butane LPG Natural Gas in Motor Home Camper
$17.95 Save $24.00 RRP: $41.95
12V Gas Detection Alarm for Propane, Butane, LPG, and Natural Gas in RVs and Campers
$17.95 Save $24.00 RRP: $41.95
CO2 Drop Glass Checker Aquarium Carbon Dioxide Monitor Tiny CO2 Indicator
$7.95 Save $19.00 RRP: $26.95
Lcd Carbon Monoxide Co Detector Poisoning Gas Sensor Monitor Warning Alarm Set Zekai
$20.95 Save $22.00 RRP: $42.95
2026 12V Gas Alarm Sensor Alarm Propane Butane LPG Natural Motor Home Camper
$13.95 Save $14.00 RRP: $27.95
MS1100 Gas Sensor Module, High-Precision TVOC and CO2 Detection, Household and Laboratory Gas Quality Sensing
$14.95 Save $1.00 RRP: $15.95
Indoor Co2 Sensor Co2 Meter Digital Air Detector Intelligent Air Quality Analyzer
$9.95 Save $30.00 RRP: $39.95
Gas Detector, Lpg/natural Gas/gas Leak Detector, Plug-in Sensor Monitor With Audible Alarm And Led Digital Display
$16.95 Save $33.00 RRP: $49.95
12V Gas Alarm Sensor LPG Propane Butane Leak Detector Waterproof LED Flash Sound Warning for RV Camping Marine Safety unbrand
$17.95
QRB1 Flame Detector Photoresistor Photosensitive Electric Eye for Burner Waste Oil Detection Red QRB1 Photocell
$17.95 Save $25.00 RRP: $42.95
Lcd Carbon Monoxide Co Detector Poisoning Gas Sensor Monitor Warning Alarm Set Hfmqv
$13.95 Save $13.00 RRP: $26.95
MQ-7 Gas Sensor, Carbon Monoxide CO Gas Alarm Sensor Detection Module
$12.95 Save $6.00 RRP: $18.95
Lcd Carbon Monoxide Co Detector Poisoning Gas Sensor Monitor Warning Alarm Set Shytmv
$10.95 Save $33.00 RRP: $43.95
​Iron Test Strip With Color Chart For 0-500 PPM Fe2+ Detection Ideal For Water Quality And Corrosion Monitoring​
$19.95 Save $6.00 RRP: $25.95
Gas Leak Detector Combustible Propane Methane Leak Warning EU Plug Combustible Gas Alarm Sensor for Home Security unbrand
$12.95 Save $10.00 RRP: $22.95
Lcd Carbon Monoxide Co Detector Poisoning Gas Sensor Monitor Warning Alarm Set Hfmqv
$13.95 Save $14.00 RRP: $27.95
LCD LPG LNG Coal Natural Gas Leak Security Alarm Sensor Warning Detector
$18.95 Save $18.00 RRP: $36.95
Gas Leak Detector Combustible Propane Butane Methane Leak Warning Combustible Gas Alarm Sensor for Home Security EU Plug
$15.95 Save $4.00 RRP: $19.95
MS1100 Gas Sensor Module, High-Precision TVOC and CO2 Detection, Household and Laboratory Gas Quality Sensing
$14.95 Save $5.00 RRP: $19.95
Mini CO2 Detector,Air Quality Monitor, Infrared CO2 Monitor for Travel Home Indoor,You Can Use Anywh
$12.95 Save $6.00 RRP: $18.95
MS1100 gas sensor module, high-precision TVOC and CO2 detection
$11.95
Halogen Gas Detector 501000ppm Sound Light Alarm Air Conditioning Refrigerant Freon Leakage Tester
$17.95 Save $9.00 RRP: $26.95
Asair Acd10 Electronic Carbon Dioxide Sensor Module Infrared Ndir High-precision Co2 Gas Concentration Detection
$12.95
Rm370 carbon monox detector
$17.95 Save $46.05 RRP: $64.00
Rm370 carbon monox detector - ZCL1978
$22.95 Save $46.05 RRP: $69.00