I looked at it and went to the companies website, That meter has a fixed probe but 2 yr warrenty. They seem to supply a lot of different instruments, but hard to say.
You might want to check out this one from same outfit, basically same I think with replaceble pH probe

http://www.gainexpress.com/product_...m/product_info.php?cPath=2_18&products_id=658&osCsid=anhop318vcatlj1a9d70854of1

 

oops

 

I never saw that one before,I like my Pinpoint.

 

do you have to calibrate your pinpoint when you first use it..? I just bought one and my ph is measuring widely from moment to moment..endded up still testing water to get the reading....

 

I wonder how well they hold calibration... and how long they last before requiring replacement.

 

Yes! You need to calibrate any unit!Just read the instructions,it's easy.Good luck with yours.You'll love it.