Ametek APM [APM15KPSI] CPF Pressure Module 15000 psi with 1/4" NPT Pressure Fitting and 0.1% Accuracy. The Ametek APM CPF Series portable pressure modules offer the functionality and flexibility to perform pressure calibrations with a multifunction signal calibrator. Or, combine with a hand-help pressure calibrator to expand its range. The APM delivers the same high level accuracy whether in the lab or in the field..