The Dillon Eliminator Balance Beam Scale is a magnetically damped, mechanical scale designed for reloading, with a 500 grain capacity accurate to ±0.1 grain.
Balance-beam scales are reliable and dependable, with no electronics to drift and no batteries to change.
This dependability has only one drawback, they are slower to use than electronic scales for unknown masses. That said, they are ideal for trickling in powder charges to a known weight.