[Myka]

I check my scales with a set of iron weights that I picked up at a yard sale real cheap years ago. They are made for the old balance type scales.

I use a digital kitchen scale to weigh piece by piece. It only goes to 25 lbs though I think, so if you had big pieces it wouldn't work. This scale cost $20 at the grocery store, and is actually quite accurate. I use it to weigh reef chemicals too for mixing for my dosers. It uses a 9V battery that I unplug when I'm not using the scale.

For larger amounts I have a digital bathroom scale that I use to weigh myself. I find it accurate enough for live rock batches that are over 100 lbs. This scale was $50 on sale at Extra Foods or something like that. Can't remember what batteries it uses.