Found this on Craigslist....is this a good pH meter?

[Biscuits]

Corning check-mate 90 pH Digital Meter w/ Calibration Check Plug

http://washingtondc.craigslist.org/mld/bfs/5315277089.html

 

[IslandLizard]

Chances are the probe is bad. They need to be stored in specific ways, usually with a cap and sponge to keep it damp or in a storage solution. Even then, they don't age well and need to be replaced every year or 2, or when it won't calibrate anymore. The probe is the $$$ part, so count on having to replace it to get it working.

You could ask to move this to the brew science forum, that's where those who know live.

 

[Biscuits]

Meh, not gonna worry about it too much...not planning to pick this up with the potential of having to spend $$$.