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so i bought the hanna combo HI98129 meter the other day. and cant seem to get it calibrated right..im doing it right, its just off ever time like when its done calibrating in the 4.01 it starts dropin an keeps going to like 3.7ish :wall:.. an if i put it in new cup with 7.01 or 4.01 there both...

hey, whats up everyone.. im new here, and still a fairly new grower just lookin for tips and help with any problems that i might run into..