50/60HZ speed measurement function. Suitable for global grid frequency

Quality: 1: Precision control car system all aluminum surface oxidation treatment. 2: Scale laser engraving and accurate permanent

Base diameter: 76.5mm

Main body diameter: 64mm

Height: 33mm

Hole shaft diameter: 7mm

Measure the speed method: first of all, the record suppression to the turntable of the record player, turn on the record player, the record player turns up, in the fluorescent light, look down, see whether the scale line is clearly visible, such as measuring the speed of the points on the scale line uniformly visible, and does not move left and right, then the speed is accurate, if it is more fuzzy or connected to a piece of the world, and left and right, then the speed of rotation is not normal. This test method is for reference only.