Dissolved Oxygen Meter Kit Reliable DO readings at a reasonable price. Measures dissolved oxygen to determine water quality in environmental testing, labs, industrial and municipal waste water, aquariums and fish hatcheries. The back-lit display simultaneously displays dissolved oxygen (in % or mg/L) and temperature readings (in °C or °F). Automatic temperature compensation as well as manual compensation for salinity and altitude (all factors affecting DO readings). Features simple one-button calibration to air. DO probe heads include built in membranes and screw on and off for easy replacement. Also functions as a pH, ORP, Conductivity, TDS or Salinity meter when used with the optional probes. Comes in a hard carrying case complete with DO probe, 2 spare probe heads, electrolyte, instructions and a 9V battery. EPA Equivalency Method: 360.1 and Alpha Method 2580.1992. Meter Dim: 7" x 2¾" x 1¼" (177 x 68 x 45 mm). Meter Weight: 16 oz (489 g). Kit Dim: 11" x 9½" x 2" (279 x 241 x 51 mm). 850081DOK Dissolved Oxygen Meter Kit Specifications * DO Range: 0 to 20 mg/L * DO Accuracy: ±0.4 * O2 Range in Air: 0 to 100.0% * O2 Accuracy in Air: ±0.7 * Temperature Range: 0 to 50 deg C/32 to 122 deg F * Temperature Accuracy:±0.8 deg C/±1.5 deg F * Resolution: 0.1