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This site was last updated on February 15, 2008.

Here's a version that Bob Mattes put together (for free flight). He modified the circuit slightly to use a couple of LEDs (instead of a meter) to indicate a good or bad glow plug. He also used 4 NiMH 2.2 AH batteries as the power source, allowing it all to fit into a 2 x 2.75 x 4 inch box.