PINPOINT II Oxygen Monitor PINPOINT II Oxygen Monitor will quickly and accurately display a digital readout for dissolved oxygen in either % oxygen or ppm saturation. The measurement range is 00.0 20.0 ppm. The probe is a high performance polarographic type, which uses pre-loaded Teflon membrane caps and electrolyte fluid. This is the #1 preferred oxygen monitor in the aquaculture industry. The PINPOINT II Oxygen Monitor is an extremely good value, considering its high precision and ruggedness. PINPOINT II Oxygen Monitor includes: Monitor with attached High Performance Probe, Membrane Cap and 5 foot cable (1.5 meters) Extra Membrane Cap Electrolyte Fluid (1 bottle 30mL) Extra Membrane Cap/Fluid kits are available, and the 13 foot (4 meter ) probe extension cord is an optional accessory. The commercial aquaculture market purchases a significant number of these units on a very regular basis. This meter is very field portable and fits inside a shirt pocket. Given proper care, the PINPOINT II Oxygen Monitor should last a lifetime. Competes with meters in the $700 range. Powered by a standard 9-volt battery (not included). Optional AC Adaptor Kit. Replacement Membrane Cap and Fluid Kit Optional 4-meter probe extension cord. Replacement Oxygen Probe For more details, see Users Guide.