$100.00
SE
SMART SENSOR smart sensor AS8700A carbon monoxide Detector, range 1~ 1000PPM
ElectrochemistryCO
Electrochemical sensor, detection of gas CO, range 1~ 1000ppm, resolution 1ppm, detection accuracy +/- 10%, response time < 60s, buzzer alarm

$134.00
SE
SMART SENSOR AR5750B SF6 Tester
Halogen gas, SF-6
Halogen gas, SF-6, response time instantaneous, warm-up period < 6 seconds, continuous working time 5 hours, sensitivity to halogen refrigerant 3 gr/year, low power indication 3.3V +/- 0.2V, operating temperature 0~52 ℃, sensitivity adjustable

If you don't know how to choose "Gas detector", please consult customer service.