I have the 'drug dealers' 0-50g' unit for small items. Do get the calibration weight. I had a set from a pan balance, and discovered that mine calibrates on 25 (and or - cant recall which) 50g.
I also have a triple beam 0-610g.
I use dixie cups for weighing boats, and tare them with a small length of wire hung off of the end of the beam in a hole meant for range extending weights.
I also have lucked into buying an electronic balance meant for mixing auto paint tints 0-7000g in .1g scale for $2 that seems to be in perfect shape.