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Powerhobby BMA01 Brushless Motor Analyzer and RPM and Voltage Motolyzer Steam Loco - 2-6-2 Reuses factory ball bearings forPowerhobby BMA01 Brushless Motor Analyzer and RPM and Voltage Motolyzer Motor Analyzer is a precision electronic device that is specially designed for measuring the KV value, RPM, current drawn, motor timing, vibration noise level, and checking the function of hall effect sensors of a brushless motor. It comes with a 2X16 characters LCD that is able to display the real time measuring value of either sensor or sensor less brushless motor. KV VOLT RPM