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The Ashcroft 1305D series portable deadweight tester is a pressure calibration system that includes a low range and high range piston assembly, weight set, a hydraulic (oil) test pump to generate test pressures, metal carrying cases, tools, and other accessories. Depending on the weight set provided, the 1305D is capable of establishing test points from 15 to 10,000 psi in an accuracy of ±0.1% of reading. As a primary standard, the company claims the 1305D will provide years of accurate calibration measurement, helping to ensure that pressure instruments operate safely and reliably.