Ametek Crystal M1 [M1-30PSI-DWX] Digital Pressure Gauge, 1/4" NPT Male, 0 to 30 PSI w/ Pump System D (water) 0 to 350 bar, Full Liquid & Aluminum Case. The M130PSIDWX 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.