The Extech DO600 ExStik II meter displays oxygen content as a percent of saturation from 0 to 200. 0 percent or a concentration of 0 to 20.00 ppm (mg/l). It has adjustable altitude compensation (0 to 20,000 feet in increments of 1,000 feet), adjustable salinity compensation from 0 to 50 ppt and an analog bar graph function for displaying trends. Included are a DO electrode, probe cap, replacement membrane cap, electrolyte, 4 CR2032 batteries (3 V) and a 1.2 m neck strap.