YSI 559 DO Replaceable Probe servicing kit The YSI ODO RTU is

The YSI ODO RTU is an optical dissolved oxygen and temperature probe assembly that communicates directly with PLCs

multiparameter photometer for water quality testing in the field and laboratory

It is also ideal for in-line filtration without a power source

2 and 3 point calibration

1-year sensor warranty (6-month Galvanic)

YSI 559 DO Replaceable Probe servicing kit The YSI ODO RTU isUser replaceable dissolved oxygen sensor for the YSI 550A and 556 multiparameter handhelds. Swap in a fresh sensor in the field in minutes, without sending the instrument in for service or replacing the whole cable assembly. Uses a convenient screw on membrane cap for simple membrane changes. Used with: YSI 550A and 556 One year sensor warranty. 556 Manual 556 Spec Sheet