COATING THICKNESS GAUGE The Extech CG104 is a pocket-sized coating thickness tester that offers quick one-handed operation and non-destructive measurements of the thickness of ferrous and non-ferrous substrates. Its unique reversible display allows you to take readings in challenging angles of area being measured, plus it has an easy-to use menu system and backlit display feature. Built-in memory stores/recalls up to 255 readings. Complete with two AAA batteries, calibration standards (one ferrous plate, one non-ferrous plate and one standard coating plate film), wrist strap and soft case. Features : Magnetic induction for ferrous substrates Eddy current measurement for non-ferrous substrates Audible high/low limit alarms Substrate Zeroing and two-point calibration function Record/Recall Min/Max/Average readings. Includes : AAA Batteries Wrist Strap Soft Case Ferrous Plate Non Ferrous Plate Standard coating plate film.