YSI Model 550A Dissolved Oxygen Meter.  Looking for a rugged, field-worthy instrument for measuring dissolved oxygen? The YSI 550A DO features a waterproof IP-67, impact-resistant case and innovative field-replaceable DO electrode modules. Measure dissolved oxygen and temperature simultaneously using YSI's proven polarographic technology for oxygen and YSI Temperature Precision ^TM thermistors, the worldwide standard for accuracy.

3 year warranty on meter, 1 year on probe.  Features user-replaceable DO module and screw-on cap membranes.  Cable available in 12, 25, 50 and 100 ft. lengths.

YSI DO-200 Dissolved Oxygen Meter.  From YSI's "EcoSense" line of products. Designed for simple, one handed operation for dissolved oxygen and temperature the DO200 is a logical choice. The low overall cost of ownership includes an economical list price, competitively priced DO membranes compared to other manufacturers, and rugged, reliability limiting down time.  Select from 4 or 10 meter cable lengths.

Now Available - interface with YSI self-stirring BOD Probe!

YSI Model 5000 and 5100 BOD Meter.  YSI engineered the YSI 5000 BOD Meter  to meet the expanding needs of laboratory instruments. These dissolved oxygen instruments feature: auto-calibration, large, graphic displays and low keypad profiles for maximum efficiency.

The full-featured YSI 5100 BOD Meter instrument offers even greater performance and flexibility with auto calibration and built-in SOUR software to meet U.S. EPA 503 regulations for safe use of biosolids. OUR (Oxygen Uptake Rate) and SOUR (Specific Oxygen Uptake Rate) are also valuable process control tools because they indicate the biological activity of microorganisms used in treatment. The YSI 5100 can also be used with YSI's BOD Analyst Software and a barcode scanner.

Both meters require the YSI 5010 BOD Probe.  An adaptor is available to connect to the YSI 5905 BOD Probe.