Aquaman that Hanna is their older version btw the new one is more rounded And it shows both pH and TDs on the same screen now instead of having to switch back which is like how mine is .
I've had my 9814 for a year and a half still using the probe it came with as I use it the correct way and it has never dried out nor will it ever I also use cleaning solution monthly for it and calibrate it every use if I want or every other is fine too... I paid 140 for mine and I got 2 extra probes for it which is that price Alone and solutions too it was one hell of a deal..So that one you sent was their 1st version of the 9814 as it's the growpro line as there is another company with that name and changed it to groline..I was supposed to get the growpro which it was on sale and they sent me the groline instead but nothing really changed they changed the end plug from like a mini xlr to a reg size xlr the mini screws in and the xlr does not which I like the mini better but o well still a great Meter and very pleased with it and glad I got it like over a
bluelab.....
If your going to leave the probe in the water at all times then u could make ur own but they still are not cheap but when is quality which is accuracy and dependable cheap.....
How about getting a truncheon meter if not too