... , 50HzSpeed setting range100-1200rpm, precision 1rpm, margin of error ≤ 5%;Beep tone period setting range1min-24hr, precision 1minDrill chuck clamping range1 ... time to time to remind: You can pre-set the beep tone to remind the cycle (interval length), running every other ... week we will send out a few seconds of the beep sound, there are three different lengths of the buzzer sounds ...