Customer Review

Reviewed in the United States on January 12, 2019
7, 10 and solution are good. The pH 4 liquid tested high at 4.11 at room temp. I cleaned my sensors and recalibrated, same. Luckily I had a spare pH 4.0 and that came up normal, 4.02.
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Product Details

4.7 out of 5 stars
4.7 out of 5
419 global ratings