Still easy to use. It looks like this will work for a while. Sometimes it fluctuates between two readings, so I rate it between two numbers. This agrees with the readings as I drained my hydroponic tank after testing and it agrees with the nutrients added after refilling. Check your EC or PPM, whichever you prefer, but I like knowing the reservoir is right where it should be. For the novice hydroponic grower, this is an extremely useful tool to calm the nerves. Measurement already seems like second nature to stay within the confines of successful cultures.
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