az2000
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No I dont have a pen. Ill order one from amazon this week.
FYI: you don't need calibration. A sub-gram scale is handy to have. If you can accurately measure 1 gram of ordinary salt (from the kitchen) and mix it into 1 liter distilled water, that's 1000ppm. I use the Horizon Pro-20B scale to measure things like this. It has .001 resolution. But, there are more typical scales that go to 100g with .01 resolution. That should be accurate enough too. (I use the Horizon HB-01 scale for that.). They're both cheap scales, you find them on ebay.