Make a super-simple LED tester and emergency light source.

As part of some recent competition prizes I included a little hand-made LED tester and some LEDs. For those who wish to make one themselves, here's how it's made.
You'll need a PP3 battery snap - It's usually best to get a pack of them. A 330 ohm resistor - the standard quarter watt type is fine. A bit of heatshrink sleeving to cover the resistor and a two pole socket connector of your choice to stuff the LED leads into. I used a Molex style connector, but you could use a two pole Dupont one too. Remember to make sure you get the inserts for your connector as they are often sold separately.
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