The Level TROLL 700H, available in a vented (35ft (11m)) configuration, exceeds USGS surface water stage-accuracy specifications. 3D factory calibration ensures accuracy across all field temperatures. And low-maintenance deployment saves on time in the field and cost. This premium instrument easily integrates with accessories and in-well mounted telemetry systems. Add HydroVu Data Services for real-time feedback on all of your water monitoring sites.