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I just bought a bluelab Conductivity pen, which i have in the picture below. It was an attractive price to replace my untrustworthy cheap yellow tds meter and from what I see it measures ec ppm 500 and ppm 700. When i recieved it, i was under the impression it was already calibrated and tested my tap water which i know is a little hard. It read 0 in all scales. I have ec calibration solution coming tomorrow but i was just wondering if anybody had experience with this pen at all. I looked at other models which i think are older and seen them labeled as PPM pen and not Conductivity pens. Also which scale do i use for tds? 500 or 700?