Simple measurement tool. To show you if there is an electrostatic charge.
The LED shows what’s the sign of the charge.
The meter is very sensitive. At a decimeter distance, a charge is detected
You can download English or Dutch version of the front.
I use Lasercutter and 3 mm acrylic for the front.
Enclosure I bought at the local shop Okaphone.
The Hammond 1591B enclosure fit exact.
Explanation is in Dutch language.
But look and you'll easy to understand the possibilities of the meter.
The circuit is based on Thomas Kim design. (Google his name on Youtube)