The DOB21, a benchtop dissolved oxygen meter and amperometric dissolved oxygen probe, features automatic temperature compensation for field or laboratory applications. It provides an RS-232 output, auto calibration for all parameters, salinity and barometric pressure compensation, and data logging up to 99 points. Programming is performed via a three-button keypad and stored in non-volatile memory. Suitable apps include testing biological samples, water and waste water, as well as aquariums. Price starts at $1,008. OMEGA ENGINEERING INC., Stamford, CT. (800) 872-9436.