The meters to be used by the city in its service lines shall be of the disc type and shall be of a standard pattern, equal in workmanship, material and efficiency to the Badger, or approved equal. All meters shall be of the ordinary straight or three-dial reading type and shall show the number of gallons of water consumed. They shall be constructed to withstand a normal working pressure of not less than one hundred (100) pounds and a test pressure of one hundred fifty (150) pounds. (Prior code § 38-1-24)