Wheel Diameter Gauge with digital display and android and Specification- Measuring Range Available: 600 to 1250 mm, Measuring Accuracy *: +- 0. 3 mm ( For Tread with Surface Finish N7 to N8 or Better ), Applicability: B. G. Wheels, Least Count: 0. 1 mm or 0. 01 mm ( User Selectable ), Distance between axes of ball base: 250 mm +- 0. 5 mm, Display: 7 segment LED, Size of Display: Width 5. 2 Cm. & Height 1. 5 Cm., Recording of readings: Yes available on Android Phone/ Tablet, Operating temp:- 5 Degree C to + 50 Degree C, Weight: Approx. 650 gms., Power Supply: In- built NiMh rechargeable battery. Make/ Model: WD- 2 ( E ) BT or Equivalent.