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Under $20 Gas Detectors

Shop the best prices on 1,130 great value under $20 gas detectors. Shopping for gas detectors is easy with Fruugo, with SALE discounts, offers and savings on Other and Shanghai Yangxin. Buy gas detectors online safely with Fruugo, with secure payment and fast shipping to Australia.

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1 - 32 of 1,130
Air Quality Monitor 5 in 1 Air Quality Detector C02 Detector White
$18.95 Save $5.00 RRP: $23.95
3 in 1 CO2 Meter Air Quality Monitor Handheld 5000Ppm CO2 Monitor Measurement Carbon Dioxide ℃/℉ Det
$22.95 Save $21.00 RRP: $43.95
Rm370 carbon monox detector - ZCL1978
$18.95 Save $50.05 RRP: $69.00
Rm370 carbon monox detector
$15.95 Save $14.00 RRP: $29.95
CO2 Air Detector Carbon Dioxide Detector Agricultural Production Greenhouse CO2 Monitor White 25-26s
$19.95 Save $20.00 RRP: $39.95
6 In 1 Air Quality Detector Lcd Large Screen Co2 Meter Pm2.5 Pm10 Hcho Tvoc Co Co2 Co Carbon Dioxide Formaldehyde Monitor
$13.95 Save $6.00 RRP: $19.95
Air Quality Sensor Module for VOC, Formaldehyde, and ene Detection, Level 4 Monitoring Probe
$21.95 Save $12.00 RRP: $33.95
Ordinary QRB1 Flame Detector Photosensitive Electric Eye Burner Detection Photoresistor Red QRB1 Photocell For Burner Waste Oil
$7.95 Save $4.00 RRP: $11.95
5 in 1 CO2 Meter 400-5000 PPM Sensor Carbon Dioxide Detector Air Quality Monitor jy
$14.95 Save $13.00 RRP: $27.95
Gas Leak Detector Natural Gas Detectors Combustible Gas Detector
$14.95 Save $9.00 RRP: $23.95
Halogen Gas Detector 501000ppm Sound Light Alarm Air Conditioning Refrigerant Freon Leakage Tester
$19.95 Save $10.00 RRP: $29.95
CO2 Air Detector Carbon Dioxide Detector Agricultural Production Greenhouse CO2 Monitor White
$15.95 Save $53.05 RRP: $69.00
MICS-6814 Gas Sensor Carbon Monoxide CO NO2 NH3 Nitrogen Oxygen Air Quality Detection Numerical Sen
$20.95 Save $11.00 RRP: $31.95
Household Gas Detector, Real-time Alarm to Prevent Leakage, 1.3W Low Power Consumption, Kitchen Gas Safety Detector
$19.95 Save $12.00 RRP: $31.95
Natural Gas Detector, Real-time Monitoring and Accurate Detection, AC220V/DC12V, Kitchen Household Gas Alarm
$19.95 Save $12.00 RRP: $31.95
Flame Detector QRB1 Photoresistor for Burner Waste Oil Detection
$17.95 Save $9.00 RRP: $26.95
For Nikon D5100 Battery Compartment Cover
$10.95
High Precision Flaw Detection Gauge Line Width Defect Measure Line Width Defect Tool Line Defect Measuring Ruler For Line Width Defects And Measuring
$11.95 Save $67.05 RRP: $79.00
12V Gas Alarm Sensor LPG Propane Butane Leak Detector Waterproof LED Flash Sound Warning for RV Camping Marine Safety
$18.95 Save $9.00 RRP: $27.95
MQ-7 Gas Sensor, Carbon Monoxide CO Gas Alarm Sensor Detection Module
$13.95 Save $7.00 RRP: $20.95
Magnetic Detector Meter Field Strength Test Instruments Monopoly Alarm Sound
$17.95
Air Quality Monitor 5 in 1 Air Quality Detector C02 Detector HCHO TVOC Tester LCD Temperature Humid
$19.95 Save $2.00 RRP: $21.95
Formaldehyde Monitor Carbon Dioxide Detector TVOC Detector Temperature and Humidity CO 2 Air Qualit
$19.95 Save $49.05 RRP: $69.00
suitable for QRB1 Flame Detector Photosensitive Electric Eye Burner Detection-jc
$14.95 Save $7.00 RRP: $21.95
SGP41 VOC Sensor Module Dual Gas Environment Detection Industrial Wide Temperature Range STEMMA QT/Qwiic Interface
$18.95
Natural Gas Detector Responsive Plastic Reliable Combustible Gas Leak Alarm for Kitchen Household
$17.95 Save $9.00 RRP: $26.95
12V DC Coal Gas Leak Detector 104x51mm High Sensitivity Alarm
$20.95 Save $13.00 RRP: $33.95
Water Detector, 120dB Safety Water Loop Security Water Level Alarm Sensor for Kitchen
$6.95 Save $13.00 RRP: $19.95
Air Monitor Co2 Carbon Dioxide Detector Air Quality Temperature Humidity Monitor Fast Measurement Meter-dwdz
$19.95 Save $9.00 RRP: $28.95
Rm370 carbon monox detector - ZCL1978,__a
$20.95 Save $20.00 RRP: $40.95
Tds Meter Digital Water Tester- for Home, Well (Without Battery)
$2.95 Save $5.00 RRP: $7.95
2026 12V Gas Alarm Sensor Alarm Propane Butane LPG Natural Motor Home Camper
$14.95 Save $15.00 RRP: $29.95