A true, one-handed instrument, the 6PFCE measures Conductivity, Resistivity, TDS, pH, ORP, Free Chlorine Equivalent (FCE), and Temperature with the press of a button. Unlike other meters, the 6PFCE Conductivity/TDS function features three modes: KCl, NaCl, and Myron L’s own 442 Natural Water™. Selecting the mode that most closely matches the sample solution yields an accuracy of ±1% of reading. The pH function accepts 1-, 2-, and 3-point calibrations and is accurate to within ±.01 pH. The pH sensor is of a proprietary construction and includes a large potassium chloride reference solution reservoir for long life. Myron L pH sensors are also user replaceable. The ORP function is accurate to ±1 millivolt. The measurement electrode is 99.9% pure platinum, and the reference electrode is shared with the pH sensor. The innovative FCE function accurately measures ppm free chlorine using a predictive ORP value and the actual pH and temperature of the system. Calibration and maintenance are simple, so the 6PFCE can be serviced by the user. The 6PFCE is also IP67 dust-tight and waterproof, NEMA 6 submersible, and buoyant.