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I just bought a "Bluelab Truncheon nutrient meter for 135.00. When I got home I noticed 4 scales on the side of the meter--> 1. ppm X700(140-2520). 2. ppm X500(100-1800). 3. CF(2-36) 4. EC(0.2-3.6). I don't understand what the CF scale is for. From what I read, we are suppose to use the "ppm...