10 Clamp-on Meter Models 670 and 6752.4.4 DISPLAY Button• When measuring voltage or AC current, pressing theDISPLAY button replaces the measurement shown inthe lower display with the frequency measurement ofthe variable shown in the main display. Pressing againreturns to the previous display.• In temperature measurement, pressing DISPLAYswitches the displays from °C to °F of the measuredtemperature.2.4.5 MIN/MAX Function (500ms)• Pressing the MIN/MAX button once will set the meter toMIN mode.• Pressing it twice will set the meter to MAX mode.• Pressing it three times will set the meter back to normaloperation.2.4.6 Peak Function (1ms)• This function is used for measuring 1-ms peak values involtage or current.• To activate the function, press the MIN MAX PEAKbutton for at least 2 seconds, until PEAK is displayed.• To exit this function, press the button again for at least 2seconds or press the HOLD button twice. The clamp willthen return to normal mode.2.4.7 Backlight Button• Press the button once to turn the backlight on. Pressit again to turn it off.• When backlight is on, the meter will automatically turnthe backlight off after approximately 3 minutes.