Class F1 Weight Set, W1100-200 Precision, compact, and portable balances (readability 0.1 to 0.001g) can be calibrated with our Basic Class F1 Calibration Set. Included in the set are 23 stainless steel cylindrical and leaf weights: 2 x 200g, 1 x 100g, 1 x 50g, 2 x 20g, 1 x 10g, 1 x 5g, 2 x 2g, 1 x 1g, 1 x 500mg, 2 x 200mg, 1 x 100mg, 1 x 50mg, 2 x 20mg, 1 x 10mg, 1 x 5mg, 2 x 2mg, 1 x 1mg. Cylindrical weights are marked with their nominal value. All are supplied in a protective case along with tweezers, a cleaning cloth and dust brush. Class E2 Weight Set, W1101-6-100 Our Premium Class E2 Weight Set is ideal for calibration of analytical balances with a 0.0001g readability. Precision manufactured from high purity, 316 stainless steel (7.96kg/dm³), these weights are corrosion resistant with magnetic susceptibility