Personal Static Tester (PST) or Human body voltage checker is used to measure the static charge generated in our body, everybody generates the static charge walking on non anti static flooring wearing normal shoes, due to friction in between the shoe sole and non anti static flooring; we generates the static charge, we also generates the static charge wearing synthetic or woolen clothing, and if any person is carrying this charge into our ESD sensitive working area so it could be a dangerous, because of that amount of static charge is good enough to lead any fire or explosive accident, and these accidents sometimes it could be land up in serious injuries or may be fatal in some cases this instrument is ideally placed at the entrance of the ESD sensitive work area, to drain the static charge from the body while entering.