The Milwaukee meter uses a BNC connector for the probe. A BNC connector is a universal connector so any probe with a BNC can be used.
When deciding on a probe there are a few considerations that should be know before deciding
1) Temperature that you measure at. The rule of thumb is that a pH probe will last 1-2 years at 25 o
F. For every 25 o
C increase the life is cut in half. So at 50 o
C the probe wil last 6 months to 1 year, at 75 o
C it will last 3 to 6 months and at 100 o
C it will last less than 1 month.
To overcome there are different glass types. Most probes use general purpose (GP) glass. There is also high temperature (HT) glass that is rated to 100 o
C. The high temp is still brutal on the probe but the longevity will be increased. For a brewer that measures around 150 oF the HT glass is the best option to have.
2) Junction: Every pH electrode has a junction in which solution inside the probe leaks through to the sample being measured. This solution must be free flowing so there is continuity between the reference wire on the inside and the sample. Most probe use a small ceramic frit. This can become clogged is the sample has a high solids content. There are other junction types including PTFE, sleeve with ground glass and open junction. If it is for the wort then you should be okay with ceramic but if in the mash then a ground glass with sleeve would be a benefit.
3) Tip shape: The bulb can be round, flat, and bullet shaped. The round is a standard in the industry but can be a little more challenging to clean. A flat tip is easier.
4) Body type: The body of the electrode can be plastic, glass, or metal. The plastic ones typically have plastic fins around the probe to guard from breakage. The challenge is then trying to clean since the fins get in the way. The metal body ones typically use a flat tip which allows for easy cleaning.
5) Refillable or gel filled: Refillable are nice since they can be periodically refilled with the reference solution. The fill cap has to be loosened when taking a measurement so the electrolyte will flow. The gel filled ones are maintenance free.https://hannainst.com/beer-ph
The link above has an economy probe that is plastic body, polymer gel filled, GP glass, and single ceramic junction
After reviewing our electrodes I notice we do not have a HT glass version for plastic or titanium body. I will bring this up and hopefully will have that as an option for you in the furture.