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Good price for such a large stick! Ups

Eh .. I think readings above 25 are quite easy to tell. It's the reading from 5-25 that really make me feel like I'm colour blind. So by reading from the side I know if it's between 5-10 or 10-25 (if the colour shows way off the chart). So although it's meant for reasons below 10, I will still use it to help me determine if I have a reading that's below 10 or below 25. I think ultimately anything less then 25 is still pretty safe for NO3. Just got to make sure it doesn't hit 50.

RO/DI System took 25 hours non-stop to fill up my tank. Finally tank is filled up with water Bought a TDS meter and tested the following parameters Rodi Water : 0ppm Woodlands Tap Water : 72ppm Alpheus Distilled Water : 0ppm