The Amprobe WT-30 Salinity Pen-type Water Quality Meter measures the salinity and temperature of water, and is used to troubleshoot corrosion and to test water in wastewater treatment facilities, labs, pools, aquariums, car washes, and aquaculture. The dual-display LCD screen simultaneously displays salinity and temperature, and dual-scale temperature readings in F and C are user-selectable. The meter has a built-in NaCL temperature coefficient and TDS conversion factor. One-touch auto-calibration provides for in-field calibration. Normalization is fixed at 77 degrees F (25 degrees C). The hold function saves the reading for recording. The auto power off feature turns the meter off after 20 minutes, and can be disabled for readings that require more time. The meter has a replaceable pH electrode, requires four A76 or LR44 batteries (included), and includes instructions. Specifications Salinity range 0.00 to 10.00 and 10.1 to 70.0 ppt Resolution 0.01 or 0.1 ppt Accuracy + or - (1 percent of full scale) + or - 1 digit Temperature compensation 32 to 122 degrees F (0 to 50 degrees C) Dimensions 6.5 x 1.4 x 1.3 inches (165 x 35 x 32 mm) (H x W x D) Weight Approximately 0.12 lb. (56g) Standards Ingress Protection (IP)-65 for water- and dustproof body H is height, the vertical distance from lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.Salinity and sodium content measurement instruments are commonly used by researchers, manufacturers, and individuals to measure salt and sodium levels of a substance. Amprobe manufactures electrical testing equipment for commercial, industrial, and home use. The company was founded in 1948 and is headquartered in Everett, WA.What’s in the Box? WT-30 salinity meter LR44 battery (4) Instructions