Has anyone used the Hanna Instruments Alkalinity or Calcium testers?

[cryptics]

I am thinking about getting this considering it is only $20 or so more than the test kit and they say it is quick and accurate. Is it accurate?
Thanks in advance for your help

 

[lion_crazz]

Yep, I have used both and I have not had any problems with them. Very reliable and easy to use!

 

[btldreef]

All the Hanna meters are fairly decent.