The Ametek PK2654WCSS1B PKII Pneumatic Deadweight Tester, 4 to 654 inH₂O, Stainless Steel Weight Set, +/- 0.025% Accuracy is a floating ball type, pneumatic deadweight tester. This model is engineered to offer user-friendly features, safe operation, and an optimal performance in the field or in the lab. This model features a self-regulating design, that allows automatic stabilization of weights, eliminating the need to adjust input pressure. The setup for the PK2-654WC-SS-1B tester is completed by simply connecting two tubes; one for the supply and one for the unit-under-test, leveling the PK II, and adding the appropriate weights.