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Old 01-15-2002, 09:03 PM
Ken300D Ken300D is offline
Registered Diesel Burner
Join Date: Aug 2001
Location: Northern Virginia
Posts: 2,911
How does the NAPA block tester work? Is it a sensor instrument of some sort? Is it a chemical you pour in and it changes color? Is it a strip of paper?

Just curious to know what's involved.
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