Are having smaller capsule of beryllium copper. These gauges are ideal for measurement of very low pressure or vacuum normally Air or Gas which are not corrosive to copper alloy. Also recommended where gauges are subjected to mechanical vibration or pulsating pressure, Available in dial size 63, 100 and 150 mm with choice of mounting and connection M.S. case or cast aluminium weatherproof case. Accuracy of 63 mm ± 3% and 100 and 150 mm ± 2%, Standard pressure range in mmWC, mBar and inches of water column.