Greetings Seekers; Ivan, our numbers are similar (.59 to .57) but I think you may have them backwards. The instructions from Hanna and what my lab results confirmed was .59PPM/us. or take the reading in us/cm times .59 to get PPM. In my case 25.5us/cm = 15 PPM. per lab test. Also the us/cm will drop with time for the first 10-12 hrs, not rise. This appears to be due to the CS dispersing throughout the DW. Immediately after making a batch the CS is concentrated around the ion path between the electrodes. A reading taken at this time will be high and erratic. After sitting overnite the reading will be lower but stabile. After this initial dispersion the reading should not change futher. I have CS that is now several months old that still reads within 1 us/cm of when it was made. As for accuracy my PWT measures in .1us/cm up to 99.9us/cm. I calibrate it using a solution from Hanna that measures 84us. It comes in small pouches that you tear open and insert the meter. Use once and throw away. NAMASTE' Beldohr
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