I've had a very similar scale for many years and because it's mechanical you don't need batteries. I check each with a nickel (5 grams) and as many nickels as I have (and fit in the clip) to check linearity. All three passed the exam. Most of the time I only tick "1 or more than an ounce" on large cards and bubble envelopes. Your desk at work or in your car and one in your briefcase or purse. Better than guessing, you need 3 46 cent stamps when you only need two. One of the clip on the wire holder broke off (but came back) otherwise they would have gotten 5 stars.
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