PCE-TG 250 is a portable Ultrasonic Thickness Tester with an easy-to-read 4-digit display. This ultrasound-based Thickness Tester uses a contact transducer (included) to measure the thickness of coated and uncoated ferrous and non-ferrous metal, glass, plastic, and other homogeneous materials including aluminum, brass, copper, iron, lead, nickel, steel, gold, titanium, pyrex and quartz glass, nylon, polyethylene, and silicone rubber. See accessories for replacement contact gel and ISO calibration options..