Back to Reserve Equipment Balances Home Groundbreaking Research at the Resources & Research Facilities Laboratory Operations Reserve Equipment Balances Ohaus Top-loading Balance A top-loading balance is intended for routine weighing. It is not fitted with a draft shield and has a readability of 1 mg (0.001 Grams). The maximum weighing capacity is 320 Grams. Analytical Balance An analytical balance is intended for high accuracy weighing. It is fitted with a draft shield and has a readability of 0.1 mg (0.0001 Grams). The maximum weighing capacity is 120 Grams.