Quote: Timbrrline wrote in post #29
I found the pen by HM was most reliable. I calibrate every week. Same for ec pen i use. (also HM)
So far that MH is the clear "Best in Class"
Things like the tolerances of the molding and how O-rings are used not only for the battery top but the storage solution cup.
I also like the more expensive of the two "yellow" ones
I still have not received the bench-top Hanna unit or the cleaning solution so I don't want to say anything about accuracy yet
but... it looks like my "old" green pen is the unit out of whack... the continuous units just take long to adjust and are susceptible to "motion"/ flow
