Click here to enlarge imageWater quality probeIn-Situ has released the Multi Parameter Troll 9000 water quality probe. The lightweight probe uses the most current sensor and electronics technology. The probe features smart sensors, digital DO readings, and a single quick-calibration solution. The units are factory calibrated. The compact 1.75 in. diameter probes are offered in four versions, with options to monitor temperature, pressure, level, depth, DO, conductivity, pH, ORP, TDS, resistivity, salinity, nitrate, chloride, ammonium, ammonia and turbidity.In-Situ, Inc.Laramie, WYTel: 800-446-7488Web: www.In-Situ.com