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The YSI® EcoSense® pH10A pH/Temperature pen features one-hand operation, 50-set memory and low cost. Measures 0 to 14 with an accuracy of ± 0.02. The pen has IP67 waterproof grey housing; ATC; auto-buffer recognition with 1-, 2- or 3-point calibration; and a replaceable electrode. "Hold" feature locks reading on display, which has on-screen instructions. Has a belt clip and lanyard on the back and floats if dropped in water. Measures 2" W x 7.5" L, weighs 0.3 lb. One-year instrument warranty, six-month electrode warranty. Calibration solutions sold separately.