hanna alkalinity checker

Hi , Left hobby but have Hanna Alkalinity , Phosphate checkers which were bought in end of 2020 and almost new . Plus a very special Hanna HI 12302 field blue tooth pH meter that was used to check pH accurately . It connects to Hanna Lab app in iOS and android . normally this sells for 200$ ...

Alkalinity checker HI772 Hanna tester with extra reagent $50. Will ship with payapl.

This thread is for the general discussion of the classified ad 3D Printed Test Kit Organizers (Hanna, Salifert, Red Sea). For more information about this item, please click the link or ask a question in this thread. Please add to the discussion here.

There is a way to hinder the Hanna alk to show lesser and lesser dKH (or ppm for that matter) with age of open reagent bottle. I had the same story as many have reported here - my reading decrease from a new open bottle with time. Double check with another method show that there was not a real...