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. The Pinpoint II Oxygen Monitor™ comes complete with Membrane caps and electrolyte fluid, a high performance probe with 5-foot cable and meter. 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. Powered by a 9 volt battery or optional AC Adaptor. Replacement parts are available by Special Order.