Plastic Faced Panel Meters

Static electricity on a plastic face has never occurred to me before. Good to keep in mind.

While trying to zero my  metal moving coil plastic faced meter on some equipment I discovered that the plastic face of the meter can get charged with static electricity totally throwing off the calibration of it. I also have experienced this on some of my tube testers, which totally threw off the recalibration. Quite annoying if you don't catch this right at the start,