Auto Test Pen With Double Function

Hello, friends.

Today we are going to do here is a probe car. It has two functions, namely - a show contact with the car body, as well as the presence of a voltage of 12 volts.

Detailed assembly and demonstration work can be seen on the video.

We need

• Syringe 5 cubes;
• 4 LR44 batteries;
• Two LEDs with a resistor;
• A piece of steel wire;
• Wire with a clip at the end;

All is ready.

Detailed assembly and demonstration work can be seen on the video.

Thank you for attention.