Ametek Crystal M1 [M1-30PSI-CXX] Digital Pressure Gauge, 1/4" NPT male, 0 to 30 PSI w/ Pump System C (Oil) 0 to 200 bar, Full Liquid & Aluminum Case. The M130PSICXX Crystal Pressure Gauge maintains a reading reading of 0.2% from -10˚ to 50˚C. Accuracy is not affected by drops, overpressure, vibration, temperature or rapid pressure changes.