Solinst 407 Bladder Pump Configuration:1.0" Stainless Steel x 2ft - 316 SS Balls It delivers a standard 4–20

It delivers a standard 4–20 mA output accepted by virtually any datalogger

5" LCD and capacitive touch keypad that measures dissolved oxygen (concentration and % saturation) and temperature using an auto-recognizing digital galvanic DO probe

Backlight display and enlarged font capability

6V lithium battery kit for Seametrics LevelSCOUT 2X and BaroSCOUT 2X dataloggers

Solinst 407 Bladder Pump Configuration:1.0" Stainless Steel x 2ft - 316 SS Balls It delivers a standard 4–20The Solinst 407 Mk2 Bladder Pump is a pneumatically driven groundwater sampling pump built around a flexible Santoprene bladder inside a rigid stainless steel or PVC body. Compressed air or nitrogen from a surface control unit pressurizes the space between the bladder and the housing, collapsing the bladder and forcing the water inside it up through a check valve to the discharge line; venting the drive pressure lets the bladder re expand and refill