Due to this device is sensing the human body’s resistivity, and almost all people are different from each other, this device will suit all users.  This device can be pre-set to suit most users too.

 

(A)If the body resistance is low, turn left to increase the resistiviity. When the lamp is lighted green, you are in the right position.

(B)If the body resistance is strong, turn right to reduce the resistivity.  When the lamp is lighted green, you are in the right position.