I have been buying the $35 yellow one, runs on a single nine volt battery, MIC, "no user serviceable parts inside".
My best one lasted a year, I have returned one DOA, generally they last me three months or so.
Since I was going to throw this one away too, I decided to open in up and see what failed since there were "no user serviceable parts inside."
First I pulled the battery and licked it, plenty of juice. Then I pulled the six wee tiny #1 phillips screws holding the case together. Took the cap off the pins, pulled the case halves apart, one more wee screw so I could see the solder joint side of the printed circuit board.
I pulled off my glasses, turned on all three work bench lights, everything looked OK. So I hooked the battery back up, low and behold the thing was working.
I re-assembled it without the buttons over the switches, it's working fine and giving believable numbers. I do need a wee tool to reach down in the hole is all.
My best one lasted a year, I have returned one DOA, generally they last me three months or so.
Since I was going to throw this one away too, I decided to open in up and see what failed since there were "no user serviceable parts inside."
First I pulled the battery and licked it, plenty of juice. Then I pulled the six wee tiny #1 phillips screws holding the case together. Took the cap off the pins, pulled the case halves apart, one more wee screw so I could see the solder joint side of the printed circuit board.
I pulled off my glasses, turned on all three work bench lights, everything looked OK. So I hooked the battery back up, low and behold the thing was working.
I re-assembled it without the buttons over the switches, it's working fine and giving believable numbers. I do need a wee tool to reach down in the hole is all.
