Variation in hanna alk reagent

[t5Nitro]

How much of a difference are you experiencing with hanna alk reagent from bottle to bottle? My alk is consistently 7.5 on the last bottle. New one today shows that I'm at 7.9. What I can do next time is test back to back old and new bottles before running out of reagent.

 

[Retro Reefer]

I have heard of others having similar issues but I have never experienced it myself, did you test the two reagents back to back? are you testing at the same time everyday?

 

[tnc112105]

Just encountered a similar issue. Consistently at 7.7. Tested the bottles back to back when I had to switch to new lot, and now consistently at 7.4. Thinking I might buy a 6 month supply from now on and see if I can request same lot # during future orders.