... in traffic, industrial place, transportation company, etc. This tester adopts big screen with blue backup light, disposable mouthpiece ... Ø Record the date automatically;Ø Calibration time confirmation function;Ø Auto-test, Passive test, level exceed alarming functions available;Ø ... ;Ø Real time battery function;Ø Auto power off functionRemark: At result display interface, auto power off time is 30 ...