KHRacing Multi-Checker TYPE1, which uses AA batteries. ・Speed measurement, magnetic force measurement, and voltage measurement are possible. ・Instruction manual included. ・Automatically turns off after a set time. ・The three black switches may sometimes be white. ・Stopwatch function included ① Speed Measurement 　Displays the speed by placing the roller against the rotating tire. 　Motor RPM calculation and display function available. 　By setting the gear ratio and tire diameter, the motor RPM is calculated and displayed from the speed. ② Magnetic Force Measurement 　A magnetic force meter specifically for Mini 4WD motors. ③ Voltage Measurement 　A voltmeter specifically for MS flexible chassis. Other chassis can also be used with some modifications. Many users have achieved good results in official races using our checker. ■ Information Basically, shipping may not be possible on Sundays and holidays. ■ Product Description ・The speed measurement range is approximately 100 km/h in a simulated confirmation environment. ・Voltage measurement is for MS flexible chassis only. If measuring with other chassis, please extend the cables, etc., to accommodate. ・The maximum measurable voltage is 3.3V. Even with fully charged alkaline batteries, it's around 3.2V. Measurement of higher voltages is not possible. ・Magnetic force measurement is for motors that can be used in Mini 4WD official rules. ・Compare magnetic force values within your own checker. 　Comparisons with other companies' products or even different units of the same checker may not be accurate. ・This is not made with a personal 3D printer, but by a professional, so the feel is good. Layered surfaces are not visible. ■ Important Notes ・This is a personally made product. Please do not expect the quality of a commercial product. ・All use is at your own risk. ・This is a product created by an individual. Please be careful. We are not responsible for any fire, injury, etc. Use at your own risk.