The Extech TKG150 is a Digital Ultrasonic Thickness Gauge and Datalogger. The compact and durable meter enables for non-destructive thickness measurements. It provides thickness gauges in a compact, portable, durable chassis that is perfect for field applications. Ultrasonic technique enables non-destructive thickness measurements for mostly steel structures. Comes with a protective holster, a 2 oz container of coolant, two AA batteries, a 5 MHz transducer, a durable carrying case, a USB cable, and exporter software.