This is an accelerator checker for Mini 4WD cars. It is a product that can be used to measure torque and speed by applying it to the tires. Main functions: ・Speed Checker Mode AVE: Displays the average speed over the last 0.1 seconds. MAX: Displays the maximum speed since startup. ・Accelerator Mode Displays acceleration {(km/h)/s, how much the speed increases per second}. ・Graph Mode Displays the speed conversion at 0.1-second intervals from the start of measurement. ・rpm Checker Mode (3 units can be registered) Gear ratio: 3.5, 3.7, 4.0, 4.2, 5.0, 6.4, 8.75, 11.2 Tire diameter: 22.0 to 35.0 rpm: Calculated backward from gear ratio and tire diameter. ・Torque Mode Displays the motor RPM and torque at the time of measurement from the gear ratio and tire diameter. Operate with the three buttons at the bottom.