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Under $20 Gas Detectors

Shop the best prices on 620 great value under $20 gas detectors. Shopping for gas detectors is easy with Fruugo, with SALE discounts, offers and savings on Shanghai Yangxin and Stormsure. Buy gas detectors online safely with Fruugo, with secure payment and fast shipping to Australia.

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1 - 32 of 620
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 $20.00 RRP: $42.95
CO2 Drop Glass Checker Aquarium Carbon Dioxide Monitor Tiny CO2 Indicator
$9.95 Save $20.00 RRP: $29.95
Gas Leak Detector Combustible Propane Methane Leak Warning EU Plug Combustible Gas Alarm Sensor for Home Security
$13.95 Save $14.00 RRP: $27.95
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
$15.95
ZE16B-CO Carbon Monoxide Gas Sensor Module
$12.95 Save $7.00 RRP: $19.95
Magnetic Detector Meter Field Strength Test Instruments Monopoly Alarm Sound
$17.95
SGP40 VOC Sensor Module Dual Gas Environment Detection Industrial Wide Temperature Range STEMMA QT/Qwiic Interface
$15.95 Save $8.00 RRP: $23.95
SGP41 VOC Sensor Module Dual Gas Environment Detection Industrial Wide Temperature Range STEMMA QT/Qwiic Interface
$16.95 Save $9.00 RRP: $25.95
MT03 Air Quality Monitor CO2 Temperature Humidity Tester CO2 Detector Carbon Dioxide Detector
$20.95 Save $5.00 RRP: $25.95
MT03 Air Quality Monitor with Stand CO2 Temperature Humidity Tester CO2 Detector Carbon Dioxide Dete
$21.95 Save $5.00 RRP: $26.95
Electrochemical CH2O Formaldehyde Sensor Gas HCHO Sensor Module Smart Home Devices
$17.95 Save $17.00 RRP: $34.95
Mini Handheld Gas Leak Detector Natural Gas Detector Combustible Gas Detector with Audible Alarm Gas Sniffer Test White
$19.95 Save $18.00 RRP: $37.95
Gas Leak Detector Combustible Propane Methane Leak Warning EU Plug Combustible Gas Alarm Sensor for Home Security
$16.95
MQ-7 Gas Sensor, Carbon Monoxide CO Gas Alarm Sensor Detection Module
$13.95 Save $7.00 RRP: $20.95
Gas Leak Detector Combustible Propane Methane Leak Warning EU Plug Combustible Gas Alarm Sensor for Home Security unbrand
$14.95 Save $11.00 RRP: $25.95
Gas Leak Detector Combustible Propane Butane Methane Leak Warning Combustible Gas Alarm Sensor for Home Security EU Plug
$16.95 Save $5.00 RRP: $21.95
Mini CO2 Detector,Air Quality Monitor, Infrared CO2 Monitor for Travel Home Indoor,You Can Use Anywh
$13.95 Save $6.00 RRP: $19.95
MS1100 gas sensor module, high-precision TVOC and CO2 detection
$12.95
SGP40 VOC Sensor Module Dual Gas Environment Detection Industrial Wide Temperature Range STEMMA QT/Qwiic Interface
$17.95
MS1100 Gas Sensor Module, High-Precision TVOC and CO2 Detection, Household and Laboratory Gas Quali
$13.95
Gas Leak Detector Combustible Propane Methane Leak Warning EU Plug Combustible Gas Alarm Sensor for Home Security
$16.95
Indoor Air Quality Monitor,CO2 Monitor/Temperature/Formaldehyde Detector/Humidity TVOC for Rooms,Gro
$20.95 Save $4.00 RRP: $24.95
12V Gas Alarm Sensor LPG Propane Butane Leak Detector Waterproof LED Flash Sound Warning for RV Camping Marine Safety
$19.95
Sensirion SGP40 Digital VOC Sensor Module VOC Index Detection
$17.95 Save $4.00 RRP: $21.95
CO2 Drop-Checker Glass Carbon Dioxide Monitor CO2 Indicator for Planted Aquarium Fish for Tank Mini CO2 Detector with Su
$17.95
SGP41 VOC Sensor Module Dual Gas Environment Detection Industrial Wide Temperature Range STEMMA QT/Qwiic Interface
$19.95 Save $4.00 RRP: $23.95
ENS160+AHT21 CARBON Dioxide CO2 ECO2 TVOC Air Quality and Temperature and Humidity Sensor Replace C
$10.95 Save $10.00 RRP: $20.95
-SGP30 ECO2 Air Quality Gas Sensor Module TVOC Detection Chip
$11.95
TPM-200A Carbon Monoxide Sensor Module CO Detection
$12.95 Save $5.00 RRP: $17.95
NDIR CO2 Carbon Dioxide Air Gas Sensor Module Infrared IR 400-5000ppm for CO2 Monitor Terminal Type
$20.95 Save $14.00 RRP: $34.95
MICS-5524 Air Quality Gas Sensor Module CO H2 Methane Ethanol Detection Board High Sensitivity for I2C for Arduino DIY
$14.95 Save $10.00 RRP: $24.95