The In-Situ Level TROLL 400 Water Level Logger eliminates problems commonly found in the industry while also providing the accuracy, reliability and ease of use needed for long-term water level monitoring. Its titanium construction outlasts specially-coated data loggers. Enhanced electronic and sensor design provide long-term accuracy with internal memory of 130,000 data points and options of internal or external power. The Twist-Lock connector eliminates worries of lost data or communication failure while procedural and data errors are reduced through easy to use Windows-based software. The Level TROLL 400 provides the confidence needed to perform highly accurate water level studies with a complete and integrated solution.

The In-Situ Level TROLL 400 Water Level Logger instrument comes standard with the ability to communicate via Modbus, 4-20mA, SDI-12 and RS-485/232. Pressure sensor accuracy has been verified to meet or exceed 0.1% of full-scale operation, while maintaining one of the smallest sensor diameters in the industry. The instrument incorporates a fully sealed power cell, warranted to operate for a minimum of 5 years or 1,000,000 readings, whichever comes first. Long-term deployment is further assured with optional external power accessories. The Level TROLL 400 can be deployed with either suspension wire or direct read cable using the In-Situ Twist-Lock connector. An optional external barometer (BaroTROLL) is available for use with the Level TROLL 400, with seamless integration of barometric pressure compensation performed through In-Situ's Baro Merge software.