Ametek Crystal M1 [M1-1MPA] Digital Pressure Gauge, 1/4" NPT male, 0 to 1 MPa. The Crystal M1 Pressure Gauge maintains 0.2% of reading accuracy from -10˚ to 50˚C. Accuracy is not affected by dropping, Ametek Crystal M1 [M1-200KPA] Digital Pressure Gauge, 1/4" NPT male, 0 to 200 KPaover-pressure, vibration, temperature, or rapid pressure change.