Manufacturer: Bluelab
Love shoppin’
Verified Purchase
4.0 calibration solution
April 10, 2022
Excellent product to ph your meter; is needed if you have a blue lab ph pen and lasts a long time. However, compared to other solutions, this is on the expensive side. I will purchase again in the future since I have the bluelab ph pen and I like to use the right products to match the pen
troutski
Verified Purchase
April 22, 2015
very misleading photo, this is only the 4.0 reference buffer....why not just use an accurate photo?
David11357
Verified Purchase
January 09, 2020
What can I say? It successfully calibrated my Bluelab PH pen. It works as it should.
Jake
Verified Purchase
August 21, 2019
Sealed perfectly works perfectly
theo
Verified Purchase
August 24, 2022
Can't go wrong with bluelab.
Paul N
Verified Purchase
Grest product
November 03, 2019
Works great, would buy again
Günter
Verified Purchase
Way too expensive
December 20, 2020
This should be 13 dollars
Lakshman Galagedara
Verified Purchase
Satisfied
March 10, 2019
Serve the purpose
Karen
Verified Purchase
March 23, 2015
very satisfied
Christopher J.
Verified Purchase
January 11, 2015
works well
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