Easy build ESD, Static Electric Detector and also Ion detector Possibly

Easy build ESD, Static Electric Detector and also Ion detector Possibly

Ridiculously Sensitive Electric Charge Detector
http://amasci.com/emotor/chargdet.html

Static electricity detector easy to make
http://www.observationsblog.com/sciencetechnologyexperiments/-static-electricity-detector-easy-to-make

Build An Ion Detector and Test Your Negative Ionizer
by Vincent Vollono from "Spring 1994 Electronics Hobbyists Handbook"
https://www.naturalsolutions1.com/iondetect.htm