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Robert from Alaska
2025-09-06 18:41:40
I own the blue lab ph pen and EC meter, and these solutions are perfect for calibration of the pH pen. I bought large bottles, still working super well a year later, probably have enough to last me another 3 years of regular monthly calibration checks/calibrations. Between the nice test pen and these solutions my hydroponic results have improved. Good stuff.
Michael
2025-08-18 10:08:15
I do not dislike anything about this product is my first time using this product with a blue lab pH pen I’ve got to say it’s worth the money both these are 16.9 fl oz. This will probably last me the next 12 months.
MJ
2025-05-03 19:18:02
I followed the directions to the letter and the calibration solutions worked perfectly. I feel so much better about my grow knowing the reading I am getting are true readings. The solution hand my Blue Labs OnePen with perfectly calibrated and fast results
Randee Pugsley
2025-04-10 09:38:26
The accuracy,easy of use and storage is why this works for me..
preston
2025-03-03 15:32:52
Works perfect for recalibration of blue lab ph pen. What else could you ask for?
Mouse
2025-02-05 12:53:29
Not Much To Say. It's accurate! No Complaints Here!
Daniel Wyand
2025-01-18 17:51:19
Bit pricy for just some calibration solution but it works as advertised.
Michael Hansen
2025-01-12 15:22:30
Both bottles state to use up within 3 months of opening. If you’re only calibrating one pen per month this won’t happen. What is the impact on calibration accuracy after 1 or 2 years with these solutions?
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