The Ametek RK50 Pneumatic Deadweight Tester, 1 to 51 psi, +/- 0.05% 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. It produces a pressure by applying force (weight set) over area (the ceramic ball and nozzle). The RK-50 is NIST traceable and accurate to ±0.05% using stainless steel weights calibrated to International standard gravity at 9.80665 m/s2. The RK tester is self-regulating with accuracy independent of the operator, which allows automatic stabilization of weights, eliminating the need to adjust input pressure. This model utilizes a virtually frictionless ceramic ball floating on a layer of air within a stainless steel cylinder. The RK-50 tester features a quick-leveling system for field or lab setup. Setup for the RK50 is completed by simply connecting two tubes; one for the supply and one for the unit-under-test, leveling the RK, and adding the appropriate weights.