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The Ohaus Starter 300 portable meters offer convenience, reliability and durability in one compact design. The ST300D Dissolved Oxygen meter features a crisp, well-organized LCD display with five clearly marked keys, built-in stand for benchtop use, memory for up to 30 measurements plus last calibration data, 1 or 2 point calibration at 0% or 100%, automatic or manual temperature compensation, temperature probe, IP54 protection and Galvanic DO electrode which eliminates warm up time associated with other DO electrodes. Also includes, wrist strap, 4 "AAA" batteries and ability to toggle amongst %, mg/l or ppm measurements.