Pen-style 4-in-1 water quality meter that measures conductivity, total dissolved solids, salinity, and temperature, showing two readings at once on its dual LCD. Features automatic temperature compensation, data hold and min/max capture, a replaceable electrode, and an IP57 waterproof housing, running on 4 AAA batteries with auto shut-off. Comes with a calibration solution, carrying case, and accessories, making it practical for field water testing.