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I just happened to have some check weights from my RCBS Powder Pro electronic scale that crapped out on me. Yes, a check weight does come with the Frankford scale. Losing the check weight that came with it wouldn't make it worthless, any more than losing the check weight that came with a $200 scale would make that scale worthless.
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There seems to be some misconceptions about terminology when it comes to digital/electronic scales. The weights supplied with a digital scale are not
check weights, they are calibration weights. The load cell needs a set weight to set the parameters for measuring other weights. It's built into the circuitry in the scale. Loose that calibration weight, your scale is worthless. Unless you can re-program the circuitry to accept a new weight as a reference.
These are check weights.
http://http://www.midwayusa.com/epro...eitemid=212586
As for the FA micro scale, I bought one, also on sale, mine wanders constantly. Needs constant calibration. Interesting to hear others say the batteries don't last long, I may try replacing mine!
As for the RCBS powder pro, Mine is 10 years old, still works like it did on day one.