The structure of the traditional type of pen is very simple, by the high resistance resistor, neon bubble, spring and cap composition, neon bubble in the low-voltage state does not emit light, generally more than 100v to light up, if it is not a fall is very difficult to damage.

High resistance resistor resistance value varies, theoretically greater than 500k ohms can meet the demand, but we hope that the greater the resistance value the better, of course, can not be infinity, then open circuit, in the measurement of the charged body does not glow, easy for us to produce a misjudgement, so the electric pen is the need for frequent inspection and maintenance.

Resistance of less than 500k ohm stylus in measuring the charged body, will make people produce a numb feeling, if the resistance is even lower, the equivalent is the hand is touching the firewire, the consequences are very serious.