Use the Orbit pressure gauge to measure your static water pressure. The static pressure is useful for determining how many sprinkler heads can go on each sprinkler line. If the pressure doesn't meet the needs of the heads, your sprinklers won't spray as far as they need to. This Orbit static pressure Gauge (200 PSI) is available in the Sprinkler Daddy Sprinkler Store at http://www.sprinklerdaddy.ca/catalog/item/6209379/6773584.htm