ohaus 700/800 tips

[Jim Rice]

I recently bought an Ohaus 700/800 for mixing darkroom chemistry. It seems pretty straightforward, but using US coins as mass standards http://www.usmint.gov/about_the_mint/index.cfm?flash=yes&action=coin_specifications it seems to mass a little light. Are coins a reliable mass standard? If it's repeatable do I care? And how critical are the ratios when mixing developers (specifically Pyrocat-HD and Micheal's Amidol)?

[John Cahill]

Harbor Freight tools used to sell a small balance scale with a set of gram weights. You might try checking their website.

[Jorge Gasteazoro]

Any gun shop should have standards in grains as well as grams....it is important to know if your scale is accurate and precise when you reload.. :)