1. Electrical parts are imported, the Microprocessor is composed of integrate circuit, with high-capacity and high-stability. 2. Plastic safe-guard; Optional universal wheel flang, 3. There are self-calibration and sill_diagnosis functions. 4. Equipped with Inch to millimeter and gram to ounce conversion function. 5. Optional plastic safe_guard. Universal wheel flange, motorcycle adaptor and large centring cone.