User Guide

Activforce 2 provides real-time strength and range of motion measurements to quantify patient progress in applications such as physical therapy and muscle rehabilitation. Activforce 2 functions as a handheld device to provide force and angle measurement when connected to an easy-to-use mobile companion application. Download the free Activforce 2 companion application from the Apple App or Google Play store.

Activforce 2 Components

  • Activforce 2 Device
  • Activforce 2 Mobile Application
  • Activforce 2 Dashboard
  • Rounded Pad
  • Arched Pad
  • Foam Insert
  • Silicone Cover
  • Hand Strap
  • Leg Strap
  • Belt
  • Belt Loop Plate
  • Custom Carrying Case

Connecting the Device to the Mobile Application

Software Versions: iOS 1.7+, Android 1.7+

1. Turn on the device by pressing and holding the device button until you see a blue LED flashing. A BLUE flashing light indicates that the Activforce 2 device is available for a Bluetooth® connection to the companion mobile application.

2. Bluetooth needs to be turned ON for the phone or tablet. If it is OFF, the app will remind you to turn it ON.

3. In the Activforce 2 app, start a measurement or select "Connect Device" in the settings menu. A list of available devices will be shown in the app. Tap "Connect" next to your Activforce 2 device in the list.

4. When the Bluetooth connection is established, the device LED will flash green periodically. A GREEN flashing light indicates the Activforce 2 device is connected to the companion mobile application.

5.The app offers two main types of tests and associated reports:

  • Force Measurements: Strength tests with left and right side options that report  measurements in pounds, kilograms, or Newtons.
  • Range of Motion Measurements: Active and passive options to obtain angle measurements in 3D space.
  • A Settings menu is available to set test parameters such as test duration, number of tests, and measurement units. A "Contact Us" page is also available to send a message to Activbody Customer Support.

6. Turn off the device by pressing and holding the button until you see a red LED blink. Multiple RED continuous flashing lights indicate a low battery charge level and the battery needs replacement. A single RED flash indicates that the device has been turned off.

Note: Always start the app and pair the device through the in-app “Connect” dialog in the app. Pairing the device through your mobile device’s Settings screen without pairing in the app will result in an error. If a pairing error occurs: close the app, turn off Bluetooth in your device’s Settings, turn Bluetooth back on, and pair the device again through the app.

Using the Activforce 2 Reports Dashboard

The Activforce 2 dashboard, available at, displays saved force and angle measurement test reports. Reports are saved to the dashboard when you use the “Save and Exit” button. Sign in to the Activforce 2 dashboard with the same email and password used in the Activforce 2 mobile application. After a successful sign in, saved test reports will be displayed in the dashboard. 

A test report in the dashboard will contain the information recorded during the administration of the test.

The dashboard will also contain all test summaries for a patient in a Patient Report, accessible by clicking on the “Patient Report” link from the dashboard home page.

Attaching a Pad To The Device

The locking mechanism is a circle with four wide gaps that securely hold attachments in place through a twist lock mechanism. To secure an attachment to the Activforce 2 device:

Align the attachment teeth with the locking mechanism gaps

Push the attachment teeth down into the gaps

Twist the attachment clockwise (toward the locked symbol) a full quarter turn

When locked, the attachment will remain in place

Measuring Force

The Activforce 2 device measures accurately when force is applied in a perpendicular direction to the large surface areas of the device or an attached pad. Application of the force should be in the center of the surface as much as possible. Direct all force into the device directly perpendicular through the device center point. 

  • Do not apply force in a non-perpendicular direction to the device.
  • Do not apply force at an angle or in a direction going across (parallel to) the device.
  • Do not apply force on or near to the blue band of the device.
  • Do not apply a force during the three second calibration period before the application starts the force measurement.
  • Do not move or shake the device during the force measurement.

Measuring Range of Motion

The Activforce 2 device can also measure angular displacement for range of motion testing. While the device is calibrating, make sure that the device is being held still in the starting position.

  • Do not rotate the Activforce 2 device in multiple axes during a measurement.
  • Do not move the Activforce 2 device in multiple planes of motion during a measurement.
  • Do not rotate the device during the brief calibration period before the application starts the range of motion measurement.

Place the device and/or subject into the starting position for test measurement and press the “Start Test” button.

Using the Device with the Hand & Leg Strap

The Hand Strap

When using the Hand Strap attachment, ensure the strap is securely fixed in position. The Hand Strap may be used to secure the device to the user for strength and range of motion tests.

The Leg Strap

When using the Leg Strap attachment, ensure the strap is securely fixed in position. Use the Leg Strap to attach the device to the subject's larger body parts for range of motion tests.

Threading the Hand & Leg Strap

Thread the strap through both loops with the logo face up and the plate face down.  

Place the device so that the locking mechanism fits into the hole in the plate. Slide your hand between the device and the strap. Pull the non-logo side across your hand. Pull the logo side over and secure the velcro. Use with desired attachment

Using the Different Pads

The Arched Pad

When using the Arched Pad attachment, ensure the attachment is securely attached in the locking mechanism. Use on hard or bony body parts for strength tests. The curve of the Arched Pad surface can be used to place the device against curved body parts.

The Foam Insert and Silicone Cover with the Arched Pad

Use of the Foam Insert and Silicone Cover is optional. For additional subject comfort, the Foam Insert can be attached to the Arched Pad by removing the adhesive backing and adhering it to the surface of the Arched Pad. The Silicone Cover can be secured in place using the grooves in the silicone to fit around the Arched Pad, providing a non-porous surface which can be easily cleaned and disinfected between uses.

To ensure accurate measurement and prevent the slippage of the device or Silicon Cover during measurement, force should ONLY be applied in a direction perpendicular to the Pad surface.

The Rounded Pad

When using the Rounded Pad attachment, ensure it is securely attached in the locking mechanism. Use this pad for all grip strength measurements and when bracing a test position  against an immovable object.

Using the Belt Loop Plate

When using the Belt Loop Plate attachment, keep the belt positioned perpendicular through the loops to reduce strain on the belt loops.

The plate is designed to hold the belt in position during a test and it is not designed to withstand force from a test. No force should be applied on the loops for a more accurate measurement. Keep the straps parallel to the direction of applied force so the force is transmitted to the device. Ensure the belt is wrapped over the smooth side of the device and not over the attachment side of the device.

The Round Pad with the Belt Loop Plate is recommended when the device is being pressed into the inanimate object.

The Belt Loop Plate may be used to guide the belt when the device is strapped to a fixed or immobile object.

Cleaning and Disinfecting the Device

To prevent the spread of infection and diseases, the Activforce 2 device and pad should be disinfected between each use. The Activforce 2 device external surfaces, including the rounded pad and the soft, arched pad silicon sleeve, can be hand wiped at room temperature with a soft cloth and a cleaning solution consisting of 70% isopropyl alcohol and water. After application, the cleaning solution should be allowed to evaporate completely.

Alternatively, a cleaning solution of 1% hypochlorite and water (10,000 ppm) can also be used to wipe the device, pads and silicon sleeves. Antibacterial hand sanitizing agents such as non-alcohol wipes or alcohol based hand gels may also be used. Any residue from these agents should be wiped away using a soft, dry clean tissue or towel.

Warnings and Contraindications

The Activforce 2 device should NOT BE USED when:

  • The user and/or subject has a known allergy to silicon or plastic materials.
  • The skin contacting the device or pad is damaged, irritated or otherwise not healthy.
  • The device or attached pad is visibly damaged.
  • The device is in an environment with high heat, humidity or pressure.

This information is provided for general informational purposes only and is not intended as, nor should it be considered a substitute for, professional medical advice. Do not use the information on this website for diagnosing or treating any medical or health condition. If you have or suspect you have a medical problem, promptly contact your professional healthcare provider. The information on this website is provided “as is” without any representations or warranties, express or implied.


If the Activforce 2 device does not connect with the mobile companion application, ensure that the application has Bluetooth permissions on the mobile device. For some devices, the Activforce 2 companion application also requires Location permissions. If connectivity problems continue to occur, follow the instructions to replace the battery or make sure your mobile device is supported.

 The Activforce 2 mobile application performs a tare operation automatically before each measurement, during the calibration phase. In addition, the device can also be manually tared. To tare the device, select “Calibrate Your Device” from the settings menu of the Activforce 2 mobile companion application.

To perform a hard reset of the device, remove the battery and re-insert it after 10 seconds. The battery and the removable pads are the only user serviceable items.

For further assistance, complaints or comments, please contact

Replacing the Battery

The Activforce 2 device comes with a standard AAA battery, which lasts between six to twelve months, depending on usage and environmental conditions.

To replace the battery, follow these steps:

  • Obtain a new AAA battery and a medium size flat-head screwdriver.

  • Hold Activforce 2 device and the screwdriver with the pad attachment mechanism facing upwards. The Activforce logo should NOT be visible.

  • Insert the tip of the screwdriver in the small opening near the power button and gently turn the screwdriver until a CLICK sound is heard and the bottom shell lid pops slightly open. This opens the first of five latches on the bottom lid.

  • Gently slide the screwdriver clockwise along the edge of the Activforce 2 device, keeping the tip inside the gap between the lid and the device, until it is about an inch and a half away from the original opening near the power button.

    Stop sliding and gently turn the screwdriver until a CLICK sound is heard. Continue sliding the screwdriver around the edge with the tip inside the crevice, stopping every inch and a half to turn the screwdriver to pop open the latches of the bottom lid. The bottom lid can be removed when four to five of the latches are opened.

Additional Information


The Activforce 2 device is certified to be compliant with all required safety standards and regulations, including electro-magnetic compatibility and hazardous materials, for all territories it is distributed in. This includes these standards: Safety IEC 60601-1 and EMC EN 60601-1-2.

The Activforce 2 device is not waterproof and should not be immersed in water or other liquids.

Similar to many electronic devices, the Activforce 2 device contains flammable materials and should not be exposed to flames or other excessive heat sources.

Service Life

The Activforce 2 device has a service life of at least 30,000 cycles, or force measurements.


In the European Union, the symbol below indicates that the product should not be disposed of with other household waste. Batteries should be discarded separately, and the device should be deposited at an appropriate facility to enable recycling. Please separate these items from other types of waste and recycle them responsibly, following your local government’s disposal guidelines

Activforce 2 Device Specifications

Activforce 2 Device Dimensions

  • Weight: (with AAA battery) 4.8 oz / 137 g
  • Length: 3.7 in / 9.5 cm
  • Width: 3.1 in / 7.8 cm
  • Height: 1.3 in / 3.3 cm
  • Volume: (approximate) 8.5 in³ / 139 cm³

Activforce 2 Device Functional Specifications

  • Force Measurement Range: 0 to 200 lb / 0 to 90 kg
  • Force Measurement Accuracy: ± (1.4 lb + 5% of the applied force)
  • Range of Motion Accuracy: ±1° for angles measured from 0° to 33°, ±3% of the measured angle when > 33°
  • System Requirement: Android 8 or higher, iOS 13 or higher
  • Connectivity: Bluetooth 4.1
  • Operating Distance: Up to 7 ft / 2 m from mobile device
  • 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

Activforce 2 Case Dimensions

  • Weight: 29.5 oz / 835 g
  • Length: 14.2 in / 36.0 cm
  • Width: 6 in / 15.2 cm
  • Height: 3.94 in / 10.0 cm
  • Volume: (approximate) 334 in³ / 5,472 cm³

Activforce 2 Accessories Dimensions

  • Hand Strap Length: 13.5 in / 34.3 cm
  • Hand Strap Width: 1.5 in / 3.8 cm
  • Leg Strap Length: 31.5 in / 80.0 cm
  • Leg Strap Width: 1.5 in / 3.8 cm
  • Belt Length: 97.6 in / 247.9 cm
  • Belt Width: 1.5 in / 3.81 cm