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D Adam Great for checking the calibration of the ph PAL Plus meter just to make sure its accurate when testing other solutions.
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Rod Ricketts Product and service excellent
A
Adrian Jackson Excellent product for calibrating my Hanna pH meter a lot better than sachets.
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Ralph McDevitt Well packaged, quick delivery. I like the idea of pre mixed buffers in bottles, much more straight forward than powder that must be mixed with distilled water
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David Matthews Perfect buffer solution.