Choosing a Digital Inclinometer by Accuracy

How does a digital inclinometer work?

A digital inclinometer measures the angle of a surface relative to horizontal or vertical using a MEMS sensor that uses gravity as its reference. Instead of a vial, a display shows the value as a number in degrees, percent or mm/m.

The sensor detects the direction of gravity across one or two axes. Single-axis units measure one tilt, dual-axis units capture pitch and roll at the same time and suit the alignment of machine beds and base plates.

Reading resolution, accuracy and range correctly

Resolution and accuracy are not the same thing. Resolution is the smallest displayed step (around 0.05°), while accuracy is the maximum deviation from the true value (around ±0.1°). A device with fine resolution but coarse accuracy pretends a precision it does not have.

• Accuracy figures often apply only near 0° and 90° and get worse in between.
• A 4 x 90° range covers four quadrants, while true 360° devices measure continuously.
• Watch the temperature dependence, because the zero point drifts with ambient temperature.
• A backlit, rotating display stays readable even overhead.

Reference function, magnetic base and calibration

The reference or zero function sets any surface as a new datum and then measures the deviation relative to it. This lets you align two surfaces to each other even when neither one is level.

• Magnetic base: holds hands-free on steel profiles, shafts and machine beds.
• Hold function: freezes the reading in positions that are hard to view.
• V-groove in the base: seats securely on pipes and shafts.
• Audible signal: reports level without a line of sight.

For documented proof, choose a device with a factory or accredited calibration certificate. Keep the contact surface clean and free of chips, because even a thin layer of dirt distorts the angle.

Frequently asked questions