The Jewell Instruments Model C820 Series Tiltmeter is a high precision submersible tiltmeter for use in fresh and salt water applications with 4-20mA output. Using an absolute gravity referenced electrolytic sensor, the C820 delivers superior measurement accuracy with virtually no longterm drift. High-gain units are sensitive to less than 0.0017 mm/m or better. All units are rated to 200 meters waterproof for advanced protection from the elements. Use the C820 "Shallow Water" for structural monitoring, angle measurement and control, platform leveling, and more.