Regin Premier '45' Gauge - Reduced Scale 45mbar REGU35Premier 45 Manometer The one and only 'Regin Premier Gauge'. Tried and tested by thousands of heating engineers all over the U. K for over 30 years and considered the gold standard of gas pressure testing through traditional means. This also means no expensive calibration costs every year as it works through gravitational readings. A solid acrylic gauge in a tough metal casing. Measures to 18in. w. g. or 45 mbar. Easy zero adjustment and a clear