The YSI Pro2030 dissolved oxygen and conductivity meter features user-replaceable sensors and cables and a convenient Quick Cal feature that makes the unit an extremely user-friendly device. The Quick Cal function allows for DO calibrations within seconds with the push of a button. Mil-spec (military spec) connectors, IP-67 waterproof and a rubber over molded case, and 1-meter drop tests ensure the instrument provides years of sampling even in the harshest field conditions. The YSI Pro2030 dissolved oxygen and conductivity meter is compatible with polarographic and galvanic DO sensors. Fast response times with these polarographic or galvanic DO sensors allows you to complete your sampling routine quickly. The long life of the polarographic sensor saves time and money and reduces your overall cost. The Galvanic sensor enables you to start sampling immediately without a warm-up period. Either sensor you choose will give you accurate, quality data. Additional features of YSI Pro2030 dissolved oxygen and conductivity meters include an internal barometer for highest accuracy, internal storage of 50 data sets, backlit display with glow-in-the-dark keyboard, 95% response in 8 seconds with standard membrane and a built-in conductivity cell. Cables and sensors for the YSI Pro2030 dissolved oxygen and conductivity meter must be purchased separately. This allows you choose the system that best fits your application. The conductivity sensor is part of the cable and included in the cable purchase.