In-Situ Rugged TROLL 200 Data Logger STEL and calibration gas should be

and calibration gas should be replaced before its expiry date to keep readings accurate and compliant

not a pressure sensor — it connects to a standard tipping-bucket rain gauge with a reed-switch output and records a timestamp each time the bucket tips

Venting the drive-line pressure lets formation pressure reopen the bottom check valve and refill the chamber with fresh water

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ensuring reliable and consistent readings

In-Situ Rugged TROLL 200 Data Logger STEL and calibration gas should beThe Rugged TROLL 200 is built for long and short term groundwater and surface water level monitoring, in pressure ranges up to 250 ft (76 m). Titanium and sealed construction including a sealed battery to reduce potential leak paths outperforms and outlasts specially coated data loggers, and 3D factory calibration with In Situ's anti drift system keeps it accurate for years of maintenance free operation. Set up, view, and download logs directly from