The Gardco Long John Gauge is a simple to use wet film thickness gauge. The low profile (of only 0.25") with the Long John's 5" length, gives added reach capabilities that defy other gauges.
Features
The teeth are incremented 0.0005" to 2.5 mils on one end and 1 mil increments from 3 to 7 mils on the other.
The accuracy of each tooth dimension is 10% of the nominal value.