Applications Horizontal  inclinometers are used to obtain high resolution profiles of settlement or  heave. Typical applications include monitoring settlement and heave under  storage tanks, embankments, dams, and landfills. Operation The Digitilt horizontal inclinometer system consists of inclinometer casing,  a horizontal probe, control cable, pull cable, and a readout unit. Inclinometer  casing is typically installed in a horizontal trench or borehole. The probe,  control cable, pull-cable, and readout unit are used to survey the casing. A survey is conducted by drawing the probe from one end of the casing to the  other, halted in its travel at half-meter intervals for inclination measurements  (two foot intervals are used for English-unit probes). The first survey  establishes the initial profile of the casing. Subsequent surveys reveal changes  in the profile if ground movement has occurred. The horizontal inclinometer probe employs a force-balanced  servo-accelerometer that measures inclination from horizontal in the plane of  the probe wheels. A change in inclination indicates that movement has occurred.  The amount of movement is calculated by finding the difference between the  current inclination reading and the initial reading and converting the result to  a vertical distance. Advantages Full Settlement Profiles: Horizontal  inclinometers provide complete profiles of differential settlement that are  useful to facility maintenance engineers as well as designers. Precise Measurements: The horizontal  inclinometer typically provides more accurate and repeatable readings than other  settlement profiling systems. Proven Performance: The servo-accelerometers used in Digitilt probes  were designed and manufactured by Slope Indicator. They have earned a world-wide  reputation for high precision, superior stability, and rugged construction. Low Maintenance: The horizontal inclinometer  probe requires very little maintenance, since there are no hydraulic lines or  pressure sources to maintain. Digitilt Compatibility: The horizontal  inclinometer probe is compatible with the control cable, indicators, and data  reduction software used with the Digitilt vertical inclinometer probe.