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- Whatever s in my jars
Just my 2 cents on these i had one and after a few months it wouldnt calabrate fully it would say it was 7.0 in the sollution but it was always a few points out no matter how much i calibrated it i ended up getting a bluelab combi meter i never looked back@Dell boy
Also - My "essentials" ph pen was cheap and lasted ..well forever since i bought it about a decade ago .. I haven't used it for a few years, but replaced the batteries when they died with no issue, and it kept working fine.
View attachment 1351243
They cost about 45 sheets (if they made £1 sheets) ^_^