The oil operated deadweight tester DOS0015 has an accuracy of 0.015% of reading. DOS001 The oil operated deadweight tester DOS001 has an accuracy of 0.01% of reading. DOS0008 oil operated deadweight tester with an accuracy of 0.008% of reading. Five different pistons are available to cover ranges from 0.25 – 25 bar up to 10 – 1400 bar. Also ranges in psi, kPa, MPa and kg/cm² are available.