Presenting a range of measuring devices in glass by lelesil engineers. The company offers mercury in glass tube type vacuum gauges for measurement of accurate vacuum and are available in two basic models. Model manometer vg 3 is meant for routine in-line vacuum and is a u-tube type manometer used for measuring vacuum. It is suitable for range from 560 mm to 760 mm hg [0 200 absolute] and is a table mounting model used for connecting in series in a vacuum applied system or device. All components in this gauge are repairable and replaceable and a wall mounting model, vg 2, is also available.