Test Gauge Texas is one of several US franchised locations for Test Gauge, Inc. Is one of the nations fastest growing suppliers of backflow products, repair kits and calibration services. Test Gauge Texas is Texas owned and operated while proudly serving all of Texas with locations in Dallas, Houston, San Antonio and Round Rock. Test Gauge Texas prides themselves in superior customer service, as well as technical assistance for our customers. Test Gauge Texas carries a wide variety and more backflow equipment than any supplier in Texas.