Metrix Instrument Co. Sw6000-6021-352 Vibration Switch/Monitor 115Vac $1,567.37 https://www.ebay.com/itm/113137140172?hash=item1a577fc1cc:g:…
Metrix Sw6000-4033-400 Seismic Vibration Switch $1,233.02 https://www.ebay.com/itm/234177133346?hash=item36860b7b22:g:…