How to distinguish between good and bad hair cut waterproof

Waterproof hair trimmer powered strength also distinguish good and bad haircut is a very important indicator. Barber dynamic strength testing has a very simple and effective method: get the machine to switch on after idling for about 10 minutes, then put a hand to pinch the blade. 1) If the machine gently pinch stopped it, and release your finger to rotate the machine does not need to turn on the switch again to close the rotation, it means the barber's power is weak, it is prone In Barber during downtime status; 2) If you need to use a larger effort to pinch the blade, and let go of the machine battery operated hair trimmer still recover the rotation, then explain this better power Barber, barber trimmers does not occur during the shutdown status.