Rotary Motion Sensor

The Vernier Rotary Motion Sensor is a bidirectional angle sensor designed to measure rotational or linear position, velocity and acceleration.

SKU: RMV-BTD Categories: ,


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The Rotary Motion Sensor lets you monitor angular motion precisely and easily. It is direction sensitive. You can use it to collect angular displacement, angular velocity, and angular acceleration data. Typical experiments include measuring moments of inertia, torque, pendula, and Atwood’s machine experiments. Even though we call it a Rotary Motion Sensor, it can also be used to measure linear position to a fraction of a millimeter.

WARNING: This product can expose you to chemicals, including chromium, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, see

Resolution: 1° or 0.25°
Optical Encoder: Bidirectional, quadrature encoder
Maximum Speed: 30 rev/s at 1° resolution 7.5 rev/s at 0.25° resolution
3-step Pulley: 10 mm, 29 mm and 48 mm groove diameter

Rotary Motion Sensor
Thumb screw
3-step pulley and mounting screw

Rotary Motion Motor Kit (MK-RMV)
Rotational Motion Accessory Kit (AK-RMV)

Rotary Motion Sensor Replacement Parts Kit (RMV-RPK)
Rotary Motion Sensor Replacement Pulley (RMV-PULLEY)

User Manual:
Warranty: 5-year limited warranty


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Our products compliment your teaching and help your students engage with key STEM concepts.

Educational Standards

Our products support provincial requirements for NGSS, AP, and more.