Gas tightness testing and checking and setting domestic and commercial appliances to the correct gas pressures is part of every day gas work and a requirement of the Gas Safety Regulations. The Rothenberger U-Gauge Manometer has innovative features, such as velcro strips for a hanging option to keep U-Gauge at eye level for ease of reading magnetic strips on rear casing allows the U-Gauge to be supported on the boiler casing during use and a scratch resistant clear facing.This U-Gauge is to be used in conjunction with Rothenberger rubber hoses (No.67017 for natural gas & No.67018 neoprene for LPG and Manometer Fluid No.67074)