The Milwaukee MI56P is the replacement pH/temperature probe for the pH55 and pH56 PRO Testers (sold separately).
The MI56P measures pH and temperature and easily slides into the tester fitting then screws into the meter body for secure installation.
Milwaukee Instruments handheld testers, portable meters and stationary monitors-controllers are warranted for a period of 2 years and bench meters for 3 years. The PH600 pH Pen and versions of it have a 1 year warranty. Replaceable probes are warranted for a period of 6 months.