Display: 4.5 digits LCD with EL backlight. Measuring Range: (0.75~300)mm (in Steel). Sound Velocity Range: (1000~9999) m/s. Resolution: 0.1mm/0.01mm Accuracy: (0.5%Thickness+0.04) mm, depends on materials and conditions Units: Metric / Imperial unit selectable. Four measurements readings per second for single point measurement, and ten per second for Scan Mode. Memory for up to 20 files (up to 99 values for each file) of stored values. Power Source: Two AA size, 1.5 Volt alkaline batteries. (The battery is not included in the package) 100 hours typical operating time (EL backlight off). Outline dimensions: 151mm75mm33 mm. Weight: 248g