My 20+ year old Zerostat continues to work just fine, and it also saw a lot of intermittant inactivity. You may be able to feel a bit of a tingle when pointed directly at your finger, but the best wayto check it will be against an itm that ha accumulated a static charge. I you have a vacuum RCM, its pretty easy to creat a static charged LP by just running several dry revolutions with the vacuum on.
