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Under $20 Gas Detectors

Shop the best prices on 639 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 639
3 in 1 CO2 Meter Air Quality Monitor Handheld 5000Ppm CO2 Monitor Measurement Carbon Dioxide ℃/℉ Det
$22.95 Save $20.00 RRP: $42.95
Air Quality Monitor 5 in 1 Air Quality Detector C02 Detector White
$18.95 Save $5.00 RRP: $23.95
-SGP30 ECO2 Air Quality Gas Sensor Module TVOC Detection Chip Compatible for Demo Board
$15.95
Lcd Carbon Monoxide Co Detector Poisoning Gas Sensor Monitor Warning Alarm Set
$16.95 Save $9.00 RRP: $25.95
MQ-3 Gas Sensor Module for Ethanol and Alcohol Detector E-Commerce Condition New Voltage Regulator Type
$14.95 Save $9.00 RRP: $23.95
High Precision Flaw Detection Gauge Line Width Defect Measure Line Width Defect Tool Line Defect Measuring Ruler For Line Width Defects And Measuring
$9.95 Save $54.05 RRP: $64.00
12V Gas Alarm Sensor LPG Propane Butane Leak Detector Waterproof LED Flash Sound Warning for RV Cam
$20.95 Save $7.00 RRP: $27.95
Tds Meter Digital Water Tester- for Home, Well (Without Battery)
$8.95 Save $6.00 RRP: $14.95
Wifi Natural Gas Sensor Tuya Smart Alarm Gas Leakage Detector Digital LCD Temperature Display for Home Kitchen
$21.95 Save $11.00 RRP: $32.95
MICS-5524 Air Quality Gas Sensor Module CO H2 Methane Ethanol Detection Board High Sensitivity for I2C for Arduino DIY
$15.95 Save $9.00 RRP: $24.95
2X Gas Leak Detector Combustible Propane Butane Methane Leak Warning Combustible Gas Alarm Sensor EU Plug
$20.95 Save $12.00 RRP: $32.95
MS1100 gas sensor module, high-precision TVOC and CO2 detection
$12.95 Save $9.00 RRP: $21.95
Formaldehyde Detector for Household Professional Self-Test Indoor Air Quality Testing Formaldehyde
$18.95 Save $3.00 RRP: $21.95
-SGP30 ECO2 Air Quality Gas Sensor Module TVOC Detection Chip Compatible for Demo Board
$18.95
Gas Leak Detector Combustible Propane Methane Leak Warning EU Plug Combustible Gas Alarm Sensor for Home Security
$16.95 Save $11.00 RRP: $27.95
LD2412 Human Presence Sensor 24GHz Radar Sensor ISM Frequency Sensitive Human Motion Sensor 9M GPIO UART Output 7PIN
$12.95 Save $2.00 RRP: $14.95
Magnetic Detector Meter Field Strength Test Instruments Monopoly Alarm Sound
$17.95
MH-Z19 MH-Z19C IR Infrared CO2 Sensor Module Carbon Dioxide Gas Sensor NDIR Accessories
$17.95 Save $8.00 RRP: $25.95
Indoor Air Quality Monitor,CO2 Monitor/Temperature/Formaldehyde Detector TVOC for Rooms,Grow Tents w
$21.95 Save $7.00 RRP: $28.95
Indoor Air Quality Monitor,CO2 Monitor/Temperature/Formaldehyde Detector/Humidity TVOC for Rooms,Gro
$19.95 Save $5.00 RRP: $24.95
Butanes LPG Gas for Tank Accurate Liquid Level IndicatorBottle Temperature Indic
$19.95
Gas Leak Detector Combustible Propane Methane Leak Warning EU Plug Combustible Gas Alarm Sensor for Home Security
$14.95
SGP40 VOC Sensor Module Dual Gas Environment Detection Industrial Wide Temperature Range STEMMA QT/Qwiic Interface
$18.95 Save $5.00 RRP: $23.95
High Precision Flaw Detection Gauge Line Width Defect Measure Line Width Defect Tool Line Defect Measuring Ruler For Line Width Defects And Measuring
$8.95 Save $50.05 RRP: $59.00
Gas Leak Detector Combustible Propane Butane Methane Leak Warning Combustible Gas Alarm Sensor for Home Security EU Plug
$12.95 Save $6.00 RRP: $18.95
NDIR CO2 Carbon Dioxide Air Gas Sensor Module Infrared IR 400-5000ppm for CO2 Monitor Terminal Type
$20.95 Save $20.00 RRP: $40.95
NDIR CO2 Carbon Dioxide Air Gas Sensor Module Infrared IR 400-5000ppm for CO2 Monitor Terminal Type
$21.95 Save $21.00 RRP: $42.95
BME680 Environmental Sensor Module STEMMA QT/Qwiic Interface Temperature/Humidity/Air Pressure/Gas Detection
$21.95 Save $20.00 RRP: $41.95
Gas Leak Detector Combustible Propane Butane Methane Leak Warning Combustible Gas Alarm Sensor for Home Security EU Plug
$11.95 Save $7.00 RRP: $18.95
Air Quality Monitor 5 in 1 Air Quality Detector C02 Detector White
$18.95 Save $4.00 RRP: $22.95
5 in 1 Air Quality Monitor, USB Rechargeable CO2 Detector Black
$20.95 Save $12.00 RRP: $32.95
Semiconductor CO2 Gas Sensor Carbon Dioxide Gas Sensor Air Quality Sensor Module UART Output JW01-CO2
$8.95 Save $4.00 RRP: $12.95