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.

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Step 1:

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;

Step 2: Very Simple Scheme

Step 3: Oppositely Connect Two LEDs

Step 4: Solder Resistor, Steel Wire, and Fill It With Hot Glue

Step 5: Bend the Contact and Put Into a Syringe

Step 6: Put the Battery

All is ready.

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

Thank you for attention.

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    3 Discussions


    3 years ago

    I like this more than a test light- only works in one direction, uses less energy- but still more dangerous than a multimeter


    3 years ago

    this clever, i worked on a design for multi-function tester, if i make it post

    1 reply

    Reply 3 years ago

    Of course make.
    If you make a link to my device - I will be very grateful.