Hanna HI-70442P TDS 1500ppm Calibration Solution.
Premixed solution for guaranteed quality and accuracy.
TDS (Total Dissolved Solids) 1500ppm.
25 x 20ml sachets.
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I don't know how you got a book printed 26 years ago in the conditions that I received it (like new) but you do it! ABSOLUTELY AWESOME!
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