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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
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
CO2 Air Detector Carbon Dioxide Detector Agricultural Production Greenhouse CO2 Monitor White
$16.95 Save $16.00 RRP: $32.95
Lead Paint Test Swabs Kit: 60 Pcs Lead Test Kit Swabs
$16.95 Save $4.00 RRP: $20.95
-SGP30 ECO2 Air Quality Gas Sensor Module TVOC Detection Chip
$17.95 Save $2.00 RRP: $19.95
III in 1 CO2 Meter Air Quality Monitor Handheld 5000Ppm Measurement Carbon Dioxide Det
$15.95 Save $43.05 RRP: $59.00
Air Compressor Pressure Gauge Y40 Iron Shell Instrument Pressure Measuring Meter
$18.95 Save $22.00 RRP: $40.95
Ms1100 Gas Sensor Module, High-precision Tvoc And Co2 Detection, Household And Laboratory Gas Quality Sensing
$15.95
Rm370 carbon monox detector
$18.95 Save $16.00 RRP: $34.95
Breathalyzer,Portable Digital Breath Alcohol Tester,LCD Digital Display for Personal Home / Party Us
$20.95 Save $9.00 RRP: $29.95
Lcd Carbon Monoxide Co Detector Poisoning Gas Sensor Monitor Warning Alarm Set Shytmv
$11.95 Save $62.05 RRP: $74.00
GY-SGP30 ECO2 Air Quality Gas Sensor Module TVOC Detection Chip
$18.95 Save $8.00 RRP: $26.95
5 In 1 Air Quality Monitor Tvoc Hcho Temperature Humidity Co2 Meter, Usb Rechargeable Co2 Detector White
$15.95
Gas Leak Detector Combustible Propane Butane Methane Leak Warning Combustible Gas Alarm Sensor for Home Security EU Plug
$19.95 Save $13.00 RRP: $32.95
Lcd Carbon Monoxide Co Detector Poisoning Gas Sensor Monitor Warning Alarm Set Shytmv
$9.95 Save $28.00 RRP: $37.95
TPM-200A Carbon Monoxide Sensor Module Interference- High-Precision CO Air Quality Detection Sensor
$14.95 Save $4.00 RRP: $18.95
2Pcs - SGP40 SGP40 TVOC ECO2 CO2 Carbon Dioxide Sensor Formaldehyde, Air Quality Monitoring Sensor
$2.95 Save $1.00 RRP: $3.95
Rosin Atomizing Pen Short Circuit Detector,for Motherboard Repair
$16.95 Save $20.00 RRP: $36.95
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
TPM-200A Carbon Monoxide Sensor Module CO Detection
$14.95 Save $4.00 RRP: $18.95
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
Voltage Detector Detector LED for Electrical Voltage Detector Electrician
$17.95 Save $19.00 RRP: $36.95
Air Monitor Co2 Carbon Dioxide Detector Air Quality Temperature Humidity Monitor Quick Measuring Meter For Co2, Black
$15.95
2pcs Mq-9 Mq9 Liquefied Flammable Methane Gas Sensor Module
$4.95 Save $6.00 RRP: $10.95
MS1100 gas sensor module, high-precision TVOC and CO2 detection
$16.95
Portable Air Quality Detector Multifunctional Digital Carbon Dioxide Monitor For Home Bedroom Office
$15.95
-SGP30 ECO2 Air Quality Gas Sensor Module TVOC Detection Chip
$17.95
ASAIR ACD10 Electronic Carbon Dioxide Sensor Module Infrared NDIR High-Precision CO2 Gas Concentrat
$10.95 Save $3.00 RRP: $13.95
LCD Carbon Monoxide CO Detector Poisoning Gas Sensor Monitor Warning Alarm Set
$11.95
2pcs Mq-6 Mq6 Lpg Gas Sensor Module Liquefied Propane Iso-butane Butane Combustible Gas Detection Sensor
$10.95 Save $1.00 RRP: $11.95
Gas Sensory Carbon Monoxide Air Quality Pollution Module for MQ-2 MQ-3 MQ-4 MQ-5 MQ-6 MQ-7 MQ-9 Multicolor
$19.95
CO2 Monitor Detector CO2 Drop Checker for Aquatic Plant Aquarium Fish Tank
$20.95 Save $7.00 RRP: $27.95