I honestly couldnt say. I would like to think so, but after testing recently I have lost faith in this checker. I tested 3 times in a row a couple days ago, and got 3 very different results.oh:
Yeah i had a bad feeling myself. I tested with my API and Hanna recently. I got very different results, granted it was the first time and the powder was new to me. I feel like the human error is in the powder. Kinda sad cuz my alk tester works like a champ.

oh:

