Rugged and reliable, the YSI Pro2030 provides everything you need in a handheld dissolved oxygen instrument with conductivity. Automatically compensates DO readings for changes in salinity. User-replaceable DO sensors and cables, 50 data set memory, and simple DO calibration makes the Pro2030 user friendly. Rugged design and 1-meter drop tests ensure the instrument remains in your hands to provide years of sampling even in the harshest field conditions. Fast response times allow you to complete your sampling routine quickly, saving time and money.