Starrett 3812 Ultrasonic Thickness Gauge is a menu driven, multfunctional tester with basic measurement capabilities.
This gauge is designed to measure the thickness of metallic and non-metallic materials such as aluminium, titanium, plastics, ceramics, glass and any other good ultrasonic wave conductor, as long
as it has parallel top and bottom surfaces.  The 3812 will accurately display readings in either mm or inch after a simple calibration to a known thickness or sound velocity.
•  Upper/Lower limit preset alarm.
• Measurment and scanning capabilities.                
• Extended memory.
• 20 memory groups (100 files/group).
• Minimum display unit: 0.01mm (0.001”)
selectable.
• 0.040-12.0” measuring range (in steel with
standard probe).
• 3280-32805ft/s (1000-9999m/s) sound
velocity range.
• 5MHz Frequency.
• 4Hz update range.
• USB output.
• Power supply: Two 3V AA alkaline batteries.
• Accuracy: ± (0.5% thickness + 0.001”).
• Dimensions: 150 x 74 x 33mm.
• Weight: 245gms.