Ultrasonic Thickness Gauge is an intelligent handheld product, which adopts ultrasonic measuring principle, and is controlled by micro processor, provides quick and precise measurement of thickness for most of industrial material. This instrument is suitable for measuring materials that are good ultrasonic conductor such as metal, plastic, ceramic, glass etc. Features: 1. Auto calibration to assure the accuracy 2. Sound velocity measurement: with a given thickness to measure the sound velocity to improve accuracy 3.12 sound velocities for different material 4. Coupling status indication 5. 12 thickness measurement data store and recall 6. Thickness alarm setup 7. Back light function 8. Low battery indication 9. Auto power off Specification: Brand: SMART SENSOR Model: AR860 Transducer: dia 6 mm 5MHZ / dia 10mm 5MHZ Measurement Range: 1.0-300.0mm (Steel) Accuracy: ±(1%H±0.1mm) Sound velocity:1000~9999m/s Minimum limit for tube measuring: dia 15*2mm(steel)(dia 6) / dia 20*3mm(steel)(dia 10) Thickness data storage: 12 groups Sound Velocity Measuring & Storage: 12 groups Power supply: 3 x 1.5V AAA battery (NOT included) Size: Approx. 270 x 180 x 80mm / 10.63 x 7.09 x 3.15in Package Weight: 1004g (approx.) Package List: 1 x Ultrasonic Thickness Gauge 1 x User Manual 1 x Storage Box 1 x Calibration Block 2 x Probes Note: Please note that the product does not come with couplant. .