So i did this myself and then decided to write this simple guide to adding a light to a Gauss Master and best of all doing this does not affect the sensitivity or reading of the meter.
You will need: Standard 3mm or 5mm 3v LED (any colour is fine but blue/red are best), Electrical wire, 82ohm Resistor, Soldering Iron, Electrical Tape, Phillips screwdriver, Stanley Knife
1. Unscrew the 4 screws on the back of Gauss master using a Phillips screwdriver.
2. Using a stanley knife or any other sharp knife cut the tape around side of the screen assembly you will see one on each side. This will allow you to lift the board away from the assembly in Step 5.
3. Make 2 leads with your electrical wire both about 15 cm in length and expose the wire on both ends by removing plastic covering. It is best to use a black and red cable so you don't mix the positive and negative.
6. Place your LED at the top of the front cover and bend the positive led to the left and negative to the right ensuring a nice snug fit above the meter needle surround.
7. Solder a 82ohm resistor to the positive cable.
8. Solder the other end of the resistor to the Positive leg of the LED and then solder your Negative lead to the Negative leg on the LED.
10. Test your circuit by attaching a battery and presing the small black switch on the circuit board to ensure your led lights.
11.Re-assemble your meter and now not worry about seeing your meter in the dark.
Notes: You may have noticed i have a switch added onto my meter and also a hole in the plastic assembly.
Switch Mod: The Gauss master meter has a power saving feature which turns the unit off after a few minutes if you are using this with a static camera or dont want to hold the meter this is not ideal. The switch i added allows the meter to stay ON constantly in either modes. I will add a guide soon to show you how to do this also.
Led On Light: The gauss master has a small led already on the board that turns on however you carnt see this so what i did was drill hole in the front plastic above the led and use a thin straw to sit on top of the led thus allowing me to see it. You can see this in the pictures above this is a simple modification and doesn't really need a guide.
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