●,IPX3 specifies a nozzle with a 0.5mm diameter opening and a flow of 10L/min. The number of holes is 121 uniform. (Can be converted with IPX4) ●,IPX4 specifies a nozzle with a 0.5mm diameter opening and a flow of 10L/min. The number of holes is 121 uniform. (Can be converted with IPX3) ●,IPX5 specifies a nozzle with a 6.3mm diameter opening and a flow of 12.5L/min. ●,IPX6 specifies a nozzle with a 12.5mm diameter opening and a flow rate of 100L/min. NOTE: A, It can be tested by a third party, but additional charge is required. B,Include pressure gauge,but these do not include Flowmeter, if you need to contact us. C, We also sell test fingers for judging the level of protection.