The simple-to-use Bladder Pump (BP) Controller (300 or 500 PSI) utilizes accurate microprocessor-controlled fill/discharge timers to sustain true low-flow sampling techniques. Both Controllers are equipped with high-pressure valves and fine resolution regulators that can perform in deep-well applications.  The ultra-reliable mini-compressor inside allows you to sample from depths to 180 feet (55 m)! No more lugging heavy, dirty, and noisy compressors into the field or those dangerous nitrogen cylinders.