... timer ,soft buttons, easy to operate 2.Dual line 4 digit display ,counting up or down 3. ... timer* Soft buttons operation , easy to operate* Dual line 4 digit display ; Power fail holding function ,up to ... voltage ,can be short circuit with +12V as signal input.Time modeTiming up or timing downOutput modeN, F ... .9h) Insulation strength100MΩ/min ( use 500V DC MΩ meter to measure) / AC 2000V ,50/60 Hz (1m ...