3M sells tape that is 1 inch wide that works well for this application. The tape is called called Dual Lock(TM) Reclosable Fastening System.
The online order code is 3M# S-15826
Apply one piece of tape with hooks to the EKG Sensor (EKG-BTA), then place the corresponding piece of tape with loops to the stationary arm of the Goniometer (GNM-BTA). You can then lock the EKG sensor to the Goniometer during the experiment.