Electrometer 211 “Banana Gauge”

This is a Electrometer 211 Coating Thickness Gauge Banana Gauge..
The Electrometer 211, commonly called the “Banana Gauge”, is a mechanical dry film coating thickness gauge used to measure the thickness of non-electrically conductive coatings (like paint, lacquer, enamel) on various substrates without electronics.

The gauge mechanically compares the thickness of a dry coating to a calibrated scale using mechanical probes and springs — no batteries or electronic readout required — which is why it excels in environments where electronics might fail or pose safety risks.