A8 Oxygen detector has the function of detecting oxygen temperature and humidity, using all the sensors are mainstream industrial grade, using 2.8-inch TFT color LCD display, suitable for automobiles, schools, homes, hospitals, shopping malls, and so on.
Features:
2.8 inch LCD HD color display.
Display the oxygen concentration and temperature and humidity values, the curve interface.
Oxygen excessive alarm peak buzzer sound (excessive alarm sound can be eliminated by pressing any key) + digital color change (alarm value default standard value), you can set 1percent -30percent  alarm value. 
Data saving function (can store 100000 data), set timing storage, delete data, view historical data.
The display brightness adjustment 5percent -100percent , the default brightness of 60percent , 10 seconds after the screen saver minimum brightness, press any key can be restored to 60percent  brightness.
Celsius  degrees C and Fahrenheit  degrees F switch, long press the  celsius  Fahrenheit  key to switch.
Specifications:
Model: A8
Color: Grey
Material: ABS
Display Method: 2.8 inch TFT full color LED backlight LCD screen
Oxygen Measurement Range: 0-30percent VOL
Oxygen Resolution: 0.1percent 
Temperature Measurement Range: -9 celsius ~55 celsius 
Humidity Measurement Range: 0percent RH~100percent RH
Lithium Battery Capacity: 2500mAh
Standard Charging Voltage: 5.0+-0.5V
Display Size: 43.2 * 57.6mm
Display Resolution: 240 (3RGB) * 320
Working Environment: -9 celsius ~55 celsius   less than 90percent RH
Item Size: 178 * 75 * 32mm  7.01 * 2.95 * 1.26in
Item Weight: 200g  7.05oz
Package Weight: 332g  11.71oz
Package Size: 22.5 * 13 * 4cm  8.85 * 5.12 * 1.57in
Package List:
1 * Oxygen Content Detector
1 * Type-C Charging Cable
1 * User Manual (English)