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Did you know that a water blaster pressure gauge does not tell you how powerfully the water is flowing from the blaster? Water blasting equipment is equipped with a gauge to give you an accurate reading of the pressure output from the unit, not the pressure coming from the nozzle or tip of the water blaster. That pressure is less than the output of the water blaster unit itself and is affected by many factors, including the gallons-per-minute capacity of the unit, the length of the hose and how wide the hose is. If you need to calculate a specific amount of spray pressure, you will need to consult a "pressure drop chart."