I've had my Zerostat since maybe 1985. Still works great. I have the black cap which verifies function but if you've lost it just put your finger on the needle as your pulling and releasing slowly. You'll know if it works!
You must have a verified phone number and physical address in order to post in the Audiogon Forums. Please return to Audiogon.com and complete this step. If you have any questions please contact Support.