Digital read out static meters

Why are these so expensive? They should be under $50.

theoriginalthor112-16-2019 5:04pm

theoriginalthor1 OP Details Discussions Posts This discussion Message User 107 posts 12-18-2019 at 06:45pm Copy Comment URL Report Comment Edit Delete they were available as science kits in radio shack without the digital readout( which should lower the cost even further).
theoriginalthor1 OP Details Discussions Posts This discussion Message User 107 posts 12-17-2019 at 12:11am Copy Comment URL Report Comment Edit Delete for cd static charge ; to prove it exists/ to prove the remedy worked.