Ordered a brake fluid tester off amazon. Spent a couple extra bucks (a whole $22) to get one with the graph readout instead of just LED's. Right out of the package it's dead, no signs of life at all. Ordered a replacement and got an empty, unsealed shipping bag. Jumped through some hoops with amazon customer service and they're refunding me, and said don't worry about sending the bad one back.
Cool.. so I cracked it open to find out what was wrong. Batteries (brand new) tested good individually but no power at the solder points to the circuit board. A little gentle prying and one of the contacts just popped right off. No solder connection to the board, it had a big blob of it on top, but nothing holding it to the board except flux.
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Cleaned up, soldered on firmly...
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Working fine
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About 2~2.5% water content on the old fluid I pulled out of my wife's Silverado SS. Not enough to panic about, but I'm glad I basted the reservoir empty and added fresh fluid. Nice to know what the numbers are instead of guessing. Too bad it's not fixing the brake issues though...
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Richard