I have some I have used daily for more than 20 years in the bird facility.
You only need accuracy to one gram for most chams except the very smallest. IF you are weighing babies (breeding) you might want one accurate to 0.1 gram but they cost more.
To be honest if just weighing one cham a good kitchen scale that weighs in grams is probably fine.
Thank you yes just to weigh a 4 month old I have kitchen scales that weight per gram just thought I'd need scales to weight in less than that for more accuracy
Not really-if he is for example 40.6 grams it would show as 41, which is "close enough". He'd need to gain or lose more than a gram to make it significant.
If you’re just weighing ingredients, you don’t need micro scales, a normal gram scale is enough. Micro,mg is only really for very precise stuff If it helps, I’ve seen both micro,mg scales and regular gram ones here https://www.allpointsfps.com/ so you can compare depending on how precise you need