For a while I have thought alot purchasing the HI-97105C kit. I'm glad I finally went ahead with the purchase.
The tester itself is amazing , very simple to use , amazing logging and can have multiple tanks set up within the log .
The only thing I would say is follow the instructions exactly, for example I'd it says 5 mixing turns only do 5 mixing turns anymore (as we always do when mixing) provides inaccurate readings.
I have compared my readings with red sea pro test kits and my reef factory sensors , its pretty spot on!