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Under $20 Gas Detectors

Shop the best prices on 443 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 New Zealand.

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1 - 32 of 443
Ordinary QRB1 Flame Detector Photosensitive Electric Eye Burner Detection Photoresistor Red QRB1 Photocell For Burner Waste Oil
$4.95 Save $24.00 RRP: $28.95
III in 1 CO2 Meter Air Quality Monitor Handheld 5000Ppm Measurement Carbon Dioxide Det
$15.95 Save $43.05 RRP: $59.00
-SGP30 ECO2 Air Quality Gas Sensor Module TVOC Detection Chip
$17.95 Save $2.00 RRP: $19.95
CO2 Air Detector Carbon Dioxide Detector Agricultural Production Greenhouse CO2 Monitor White
$16.95 Save $16.00 RRP: $32.95
6 In 1 Air Quality Detector Lcd Large Screen Co2 Meter Pm2.5 Pm10 Hcho Tvoc Co Co2 Co Carbon Dioxide Formaldehyde Monitor
$16.95 Save $8.00 RRP: $24.95
Lead Paint Test Swabs Kit: 60 Pcs Lead Test Kit Swabs
$16.95 Save $4.00 RRP: $20.95
For Nikon D5100 Battery Compartment Cover
$13.95
High Precision Flaw Detection Gauge Line Width Defect Measure Line Width Defect Tool Line Defect Measuring Ruler For Line Width Defects And Measuring
$14.95 Save $84.05 RRP: $99.00
Air Quality Monitor 5 in 1 Air Quality Detector C02 Detector HCHO TVOC Tester LCD Temperature Humid
$18.95 Save $18.00 RRP: $36.95
Fast Response Industrial Safety Sensory Probe Detection Gas Leak Detector for MQ-2 MQ-3 MQ-4 MQ-5 MQ-6 MQ-7 MQ-9 Multicolor
$19.95
Four- Humidifier Module Humidifier Control Board Atomizer Driver Board Four- Humidifier Module,Set D
$12.95 Save $8.00 RRP: $20.95
Habotest Ht60 Portable Gas Leak Detector Handheld Combustible Gas Detector With Audible And Visual
$18.95 Save $18.00 RRP: $36.95
12V Gas Alarm Sensor Alarm Propane Butane LPG Natural Motor Home Camper 2025
$19.95 Save $19.00 RRP: $38.95
2pcs Mq-6 Mq6 Lpg Gas Sensor Module Liquefied Propane Iso-butane Butane Combustible Gas Detection Sensor 26-27s
$12.95 Save $13.00 RRP: $25.95
Co2 Air Detector Carbon Dioxide Detector Agricultural Production Greenhouse Co2 Monitor White-yuyu
$18.95 Save $60.05 RRP: $79.00
Air Monitor CO2 Carbon Dioxide Detector Air Quality Temperature Humidity Monitor Quick Measuring Me
$2.95 Save $1.00 RRP: $3.95
3IN1 ECO2 ECH2O TVOC Gas Sensor Module Air Pollution Odor Sensor Y01
$14.95 Save $4.00 RRP: $18.95
5 in 1 Air Quality Monitor TVOC HCHO Temperature Humidity CO2 Meter, USB Rechargeable CO2 Detector Edition 0704 Edition 0724
$20.95 Save $33.05 RRP: $54.00
3IN1 ECO2 ECH2O TVOC Gas Sensor Module Y01
$14.95 Save $5.00 RRP: $19.95
-SGP30 ECO2 Air Quality Gas Sensor Module TVOC Detection Chip
$15.95
2pcs Mq-9 Mq9 Liquefied Flammable Methane Gas Sensor Module
$14.95 Save $15.00 RRP: $29.95
Lcd Carbon Monoxide Co Detector Poisoning Gas Sensor Monitor Warning Alarm Set Shytmv
$18.95 Save $24.00 RRP: $42.95
MS1100 gas sensor module, high-precision TVOC and CO2 detection
$17.95 Save $2.00 RRP: $19.95
Ad8361 Am Microwave Detector 0.1-2.5ghz Detector Amplitude
$9.95
3pcs Ignition Coil Tester Automotive Induction Signal Detection Card Tool
$17.95 Save $56.05 RRP: $74.00
Crack Monitor Chart - Clear Plastic Ruler With Transparency Defect Chart Portable Measuring Tool For Scratch Inspection Crack Monitoring And Diameter
$17.95 Save $71.05 RRP: $89.00
MP-135 MP503 air quality detection gas sensor module MP-4 harmfuldetection,methane,Natural,methane,liquefied MP-2 flammable gas
$16.95 Save $47.05 RRP: $64.00
Lcd Carbon Monoxide Co Detector Poisoning Gas Sensor Monitor Warning Alarm Set Shytmv
$1.95 Save $2.00 RRP: $3.95
HABOTEST HT60 Portable Gas Leak Detector Handheld Combustible Gas Detector with Audible and Visual
$7.95 Save $11.00 RRP: $18.95
3pcs Ignition Coil Tester Automotive Induction Signal Detection Card Tool
$17.95 Save $61.05 RRP: $79.00
Logarithmic Power Detector Ad8361 Rf Microwave True Power Detector Am Detector Amplitude Detector 0
$14.95
MS1100 Gas Sensor Module, High-Precision TVOC and CO2 Detection, Household and Laboratory Gas Quality Sensing
$19.95 Save $2.00 RRP: $21.95