5 LED indicators show the test results more accurate.
Easy to use, only a few seconds to know the result, it shows clearly the extent of moisture contained by the light-emitting diode, high moisture content will lead to lower boiling point, affect braking performance.
Press the switch to turn on the power, the green LED light that represents the battery properly, the green light does not shine on behalf to replace the battery.
Automatic shutdown.
Power supply by AAA batteries (not included).