In-Situ® Inc.’s new smarTROLL™ Rugged Dissolved Oxygen (RDO®) Handheld Instrument and iSitu™ Smartphone Application simplify stormwater monitoring and dissolved oxygen (DO) spot checks. No training time is required to use the smarTROLL Probe or the intuitive smartphone app. Results are wirelessly transmitted to an iOS device–no bulky handheld meter is required. Users can email data, log data to a smartphone, or export a data log to a standard file format. Site details can include geotags and photos for quick identification of sampling locations. Results for DO, barometric pressure, water temperature, and air temperature are displayed simultaneously on a smartphone.