Product description: QT-PH350 is a sophisticated but durable pen-like pH meter with independent electrodes. It can be used for several years if it is operated correctly. Features Standard accessories include detachable pH test pen, pH electrode and pH 4, pH 7 standard solution Nib type pH electrode is the ideal probe for measuring permeable object, such as soil, meat, cheese etc., the electrode is embedded in a solid glass pen Detachable pH probe can be used for regular or remote measurements Automatic calibration with pH 4, 7,10 standard solutions Rotation display button Data Retention Auto power-off Small and lightweight Waterproof panel Applications Agriculture, horticulture, food processing, teaching, industrial and quality management Specifications Data reader Screen 20 mm x 28 mm LCD with rotation display function Measurement range 0~14 Resolution 0.01pH Accuracy ±0.07(5~9) ±0.1 (4~4.9, 9.1~10) ±0.2 (1~3.9, 10.1~13) (23±5â??, calibration values) Input impedance 10~12 ohms Temperature compensation Not necessary Sampling time About 0.8 s Data Retention Freeze the current display data, convenient for reading Calibration Automatic calibration with pH 7, 4 or 10 standard solutions pH electrode connector BNC interface Operating Temperature 0~50â??(32~122â??) Operating humidity