Measuring method : Ultrasonic pulse reflection
Thickness unit of : measure Millimeters or Inches
Frequency range : 5MHZ
Thickness range : AD-3253B: 0.8 mm - 100.0 mm (0.035 inches - 4 inches)
Thickness range : AD-3253: 20. mm - 200.0 mm (0.08 inches - 8 inches)
Accuracy : AD-3253B : +0.1 mm  + 0.5% (thickness range : > 0.8 mm < 40 mm)
                                           +0.1 mm + 1.5% (thickness range < 100 mm)
                                           +0.01 inches + 0.5% (thickness rang : > 0.035 inches < 1.57 inches)
                                           +0.01 inches + 1.5% (thickness rang : < 4 inches)
Accuracy : AD-3253 : +0.1 mm  + 0.1% (thickness range : > 2 mm < 100 mm)  
                                           +0.1 mm + 1.5% (thickness range < 200 mm)
                                           +0.01 inches + 1.0% (thickness rang : > 0.08 inches < 4 inches)
                                           +0.01 inches + 1.5% (thickness rang : < 8 inches)
Resolution : 0.1 mm (0.005 inches) Depending on surface condition of sample                                       
Display device : Liquid Crystal Display
Power supply : One AA dry cell battery
Battery replacement : Approximately 30 hours of operation. Low battery indicator activates when replacement is required. On hour of additionnal
Operating temperature : 0-50  c
Dimensions : 68 mm (W) x 120 mm (H) x 27 mm (D)
Weight Approximately : 180g