ITEM NAME:2020 Air Compressor Low Pressure Gauge Bar Meter Hydraulic Tester Gaug Dial E9J5 Description&Preview.Do not use on Oxygen Service. You can follow below process to chontact us. Accuracy Class: 2.5%. Maximum Process Temperature: 60 ℃. Suitable for use on air, water, oil, gas, and anything else that is not corrosive to brass.