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Look at scales with 1/100th of a gram resolution (.01 gram). Should find good ones in the $25 range on amazon. If you go with 1/100th of a gram resolution, then you can make smaller test batches of a recipe as it is only 1.13 grams of cure #1 per pound. Also get a calibration weight sized for your scale. Some larger scales have a several gram range of accuracy and that would never work for cure & spices.
This is the one I have. I have a larger scale for bulk meat measurement.
Just make sure you read the details of the scale. Many scales of this nature, including good ones, say they are accurate above 3 grams. A better scale is needed to get below that 3 gram mark. As dward51 states small experiments need a very good scale.
There are so many scales out there. Mine weighs up to 10 lbs. And does weight in grams or ounces.
However it only goes to 1/10 of a gram, but that seems to be close enough for me.
Al