I bought the pro model and several things were just not right. The meter itself and testing were not problems.
It was the equipment that came with it. The burret holder was so warped I ended up tossing it and buying another one. The black plastic part that is supposed to hold the probes and allow you to drop in the indicator solutions is out of alignment, didn't even come close to matching and there was no way I could use it. (shown with the probe in place and a hole for the burret to fit through so you can hit that tiny vial, not even close to that information. I have to angle the burret in from the side to hit it.) The stirrer will only work with that tiny plastic vial and the extras I bought with it didn't match.
I'm in the process of making new parts, mainly the prob holder, that do work along with some other equipment I've since bought. I bought a heavy "O" ring and placed it in the stirrer so I could set a small glass beaker on it and it wouldn't slide off. This does work. I also bought a steel ring to keep the beaker in place (so the second thumb on my left hand didn't dump it) but can't use it until I have the new probe holder made.
Just buy the meter and get your own added equipment.