Ashcroft 1305D [1305D-50] Deadweight Tester w/Low: 15-1000 psig; High: 75-5000 psig & SAE 20 Operating Media. The Ashcroft 1305D deadweight tester is an affordable, portable primary pressure standard, specifically designed for the precise calibration of industrial service gauges and transducers. Accurate to 0.1% of reading, the 1305D is carefully calibrated and certified traceable to the National Institute of Standards and Technology (NIST). The Ashcroft 1305D is a dual-range system which provides a "high" and a "low" pressure piston assembly and a complete set of weights labeled with corresponding high and low pressure values. Each system includes a 2-speed lever action hydraulic pressure pump capable of achieving pressures up to 10,000 psi. By repositioning a shuttle valve, the operator can select between 2 different rates of pressure generation, thereby reducing the effort necessary to develop higher pressures. To fine tune the pressure output to a specific calibration point, the pump is equipped with a secondary micro-adjust vernier displacement valve. The standard 1305D pump is designed to operate with 20 weight petroleum based motor or machine oil. For applications requiring the use of glycol or phosphate ester based hydraulic fluids, the pump is available with special seals suitable for these media. The 1305D includes a NIST traceable calibration certificate as standard. An optional certificate of accuracy is available which includes weight values for weights and pistons, piston diameter values, environmental data and NIST Test Numbers. Also included are numbered weights. The Ashcroft 1305D deadweight tester includes the tools, adapters, and accessories necessary to accommodate most field or lab calibration requirements. All of the components are conveniently stored in a metal tool box for maximum protection and portability. Weight sets are also protected in separate metal storage boxes.