What material is the resistance in the test pen?

What material is the resistance in the test pen?

Carbon solid resistance (over 1m high resistance)

Why is the resistance in the electric pen very high?

The resistance of the electric pen is very large, so that the current flowing through the human body is very small, so as to ensure personal safety
According to I = u / R, the larger R is, the smaller current is

There is a large resistance inside the measuring pen, so that when the tip of the measuring pen
There is a large resistance inside the electric pen, so when the tip of the electric pen contacts the live wire of the home circuit, the voltage applied to the human body is within the safe voltage range (36V). If the current of the neon tube of the electric pen is 0.32ma, the large resistance should be greater than () Ω at least
Analysis!

Suppose that the human body and this large resistor are connected in series to divide the voltage, the human body gets 36V voltage, the resistor gets 220-36 = 184v voltage, the measuring pen has turned on, and the current flowing through the resistor is at least 0.32ma, then the resistor is at least 184 / 0.00032 = 575k Ω

The use of large resistance in electric pen

The large resistance in the electric pen is also called high resistance. Its function is to prevent electric shock
Because the current passing through the human body is less than the minimum current that the human body can bear when using the electric pen, so when the voltage is fixed, the greater the resistance, the smaller the current