... 4.Accuracy:normally grade 1.6 or 2.5 Pressure gauge suitable for measuring the pressure of liquid, steam and gas ... ,-0.1~1.5 , -0.1~2.42.Instrument nominal diameter: 40, 50, 60, 100,1503.Instrument shell material 08F (chrome ... equal to + - 30%.(4) instrument must be installed vertically. pressure gauge