If you just need to measure a static charge right now and can’t read 28 pages, follow this:

Press the POWER button. A single beep confirms operation.

: Clear 3-digit numerical display updated 5 times per second. Status Indicators : Retains the current measurement on screen. Battery Capacity : Displays remaining power for the 9V battery. : Appears if the internal sensor is damaged. Operation & Design Push-Button Controls : Simple operation with three main buttons: (reset), and Audible Alarms