Rotary Motion Sensor

Product image for Rotary Motion Sensor
Product in use image for Rotary Motion Sensor

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


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.


  • Resolution: 1° or 0.25°
  • Optical Encoder: Bidirectional, quadrature encoder, 360 cycle per revolution
  • 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

Download the user manual for full specifications

Experiments and Lab Ideas

Select a lab book to see a list of experiments and more information.

Lab Ideas and Innovative Uses

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What’s Included

  • Rotary Motion Sensor
  • Thumb screw
  • 3-step pulley and mounting screw
  • O-ring
  • Sensor clip
  • User manual

Sensor Requirements

The Rotary Motion Sensor requires a compatible interface and software to collect data. Interface and software sold separately. Getting started with probeware »

Compatible Software

The Rotary Motion Sensor will auto-ID with Logger Pro 3.6.1 or newer and LabQuest App 1.1 or newer. All other interface and software combinations require you to manually set up the sensor or load a Logger Pro experiment file.

Download free updates to Vernier software »

Compatible Interfaces

The Rotary Motion Sensor is compatible with these interfaces:

Ordering Information

All prices are for U.S. educators.

NameOrder CodePriceQuantity
Rotary Motion SensorRMV-BTD$169
Optional Accessories
Rotary Motion Motor KitMK-RMV$12
Rotational Motion Accessory KitAK-RMV$110

Educational use only: Vernier products are designed for educational use. They are not appropriate for industrial, medical, or commercial applications. Product usage disclaimer »

Order Code RMV-BTD
U.S. Educator Price $169

Sample Data

Conservation of angular momentum
Conservation of angular momentum
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