1) Open the battery cap at the back side of the device,put in 2 pcs of AA 1.5V dry battery in correct direction.
2) Install one pc mouthpiece into the gas input hole.
3) Press the button for about 2 seconds for power on the device, along with one beep sound, the screen back light will be illuminated, the indication light above the screen will be in blue color, then the device will start a counting down from 40s.
Note:Please do not blow before the counting down fifinish. It will decrease the test accuracy.
4) After counting down fifinish, the screen will show“ blo ”.The tester can take a deep breath and then blow into the mouthpiece continuously and well distributed.The screen will scroll display“C”,keep blowing until the device give out a three beep sound, several seconds later the test result will be displayed in the screen.
Note: During blow, if the gas flflow is not steady or the gas blow is interrupted, the screen will show“rP”.
5) The indication light will be in green color when the test result is below the preset alarm level, and the screen will show the exact test result, if the test result is higher than the preset alarm level, then the indication light will be in red color, and the buzzer will also give out a hurried alarm.
Note:The device will power offff automatically if there is no operation at a long time.
6) In the whole process after power on the device, the device can be power offff if you press the button and hold it for more than 3s.
