The Ametek Model HK deadweight tester is a primary standard used to calibrate pressure and differential pressure gauges transmitters transducers recorders and controllers and can provide a reference in pressure in process control applications. Accuracy +/-0.025 PSI. Repeatability 0.0005% of output reading. Range 10 to 1500 PSI. Flow rate 3SCF at 10 PSIG to 100 SCFH at 1500 PSIG output. Includes 17 weights ranging from 1 psi to 100 psi.