The original Hand Dynamometer was sold until June of 2021. This Hand Dynamometer has grey colored grips. The finger grips are grey and square in shape. The latest version of the Hand Dynamometer (HD-BTA) started shipping in June of 2021. This Hand Dynamometer has teal colored grips and the finger grips are round. Please see the images below.
The sensor manual for the Hand Dynamometer that was sold until June 2021 can be found below.