The Jones Stephens 5 lbs. Gas Test Gauge is designed for building code inspections. It features a 2-1/2 in. diaphragm. The pressure scale is at 1/10 lbs. increments. 1/4 in. NPT male connection 2-1/2 in. diaphragm 5 PSI maximum pressure reading Scale shows 1/10 increments For building code inspections Individually boxed Get an ideal and ultimate addition to complete your hardest work easily with the choice of this JONES STEPHENS Gas Test Gauge with NPT Connection.