Frequently Asked Questions

Learn about the ActivForce device, a portable dynamometer and inclinometer revolutionizing physical therapy. Find answers about its features, usage, and benefits.


Activforce 2 is a handheld dynamometer and inclinometer made for professionals to perform strength and range of motion testing. Activforce 2 can measure:

・Active and Passive Range of Motion (AROM & PROM)

・Peak Force

・Average Force

・Force Over Time

・Force / Weight Ratio

・Muscular Symmetry

・Neuromuscular Deficits

The Activforce 2 companion app utilizes advanced technology to display and record real-time force and range of motion.

text needs updating

Activforce 2 was created for measuring the force exerted by muscles and the range-of-motion of joints. If you need accurate measurement of force or range of motion for human subjects, then Activforce 2 can fulfill your requirements.

The Activforce 2 kit includes multiple accessories for performing a variety of measurements. Inside of the hardshell protective carrying case, you will find the following items:

  • Activforce 2 device
  • Rounded pad attachment
  • Arched pad attachment
  • Silicone cover and foam insert for the arched pad attachment
  • Hand strap with an attached belt loop plate
  • Leg strap
  • Mobilization belt with an attached belt loop plate

The Activforce 2 kit also includes a free companion mobile application and a web based dashboard, both accessible after creating an account.

For force measurements, Activforce 2 is accurate within a range of 1.4 lbs. of applied force, plus or minus 5% of the overall applied force.

For range of motion measurements, Activforce 2 has the following accuracy ranges:

  • ±1° for angles measured from 0° to 33°
  • ±3% of the measured angle when > 33°

The maximum force that the Activforce 2 can measure is 200 lbs. (90 kg.).

The specifications for Activforce 2 are as follows:

  • Weight: 137 grams / 4.8 oz (with AAA battery)
  • Length: 95 mm / 3.7 in
  • Width: 78 mm / 3.1 in
  • Height: 33 mm / 1.3 in
  • Force Range: 90 kg / 200 lb
  • Range of Motion Accuracy: ±1° for angles measured from 0° to 33°, ±3% of the measured angle when > 33°
  • Force Accuracy: within ± (1.4 lb. + 5% of the applied force)
  • Max Force Load: 90 kg / 200 lbs
  • System Requirements: Android 8 or higher, iOS 13 or higher
  • Connectivity Bluetooth: 4.1
  • Battery: 1 AAA battery
  • Battery life: Approximately 6 months, may vary with usage or environmental factors
  • Operating Temperature: Range 32° to 95° F / 0° to 35° C
  • Storage Temperature Range: -13° to 122° F / -25° to 50° C
  • Operating Humidity Range: 15% to 93% relative humidity
  • Operating Pressure Range: 20.7 in Hg to 31.3 in Hg, 700 hPa to 1060 hPa

The Activforce 2 and all included accessories are moisture-resistant, but the device itself should never be submerged in water. The device and accessories may be safely cleaned with a disinfecting wipe or a cleaning solution consisting of 70% isopropyl alcohol and water.

To remove an affixed pad accessory, grasp the soft portion of the pad and twist it to the left. To attach a different pad accessory, align the locking tabs on the accessory with the matching slots on the device, and twist it to the right. This locking mechanism is designed such that the pad accessories may be fixed at multiple angles. You may continue to rotate the pad until it is fixed in the most suitable position.

Accuracy is maintained when the accessories are used in accordance with the directions in the User Guide.

text needs updating

text needs updating

The battery life in your Activforce 2 device depends upon the frequency with which you are performing measurement tests. Usually, a device’s battery will last between 6 and 12 months. Activforce 2 uses a AAA battery.

The Activforce 2 device comes with a standard AAA battery, which lasts between six to twelve months, depending on usage and environmental conditions. For visual reference, see the section "Replacing the Battery" in the User Guide

Occasionally, you may find that your strength measurements do not seem to read as accurately. If you suspect that measurements are reading slightly imprecise, go to Settings, and select Calibrate Your Device. Do not apply force before or during the calibration. This should stabilize measurement read-outs.

We no longer offer support for the original (orange colored) Activforce device. Please contact Support using the form below if you have further questions.

The Activforce 2 device is designed for use by professionals to measure strength and range of motion in athletes and individuals.

The Activ5 is designed as a personal, consumer product to perform isometric exercises.