Which tool should be used to measure an extremity when fitting a neoprene elbow sleeve?

Using a measuring tape is the correct choice when fitting a neoprene elbow sleeve, as it allows for accurate measurements of the circumference of the elbow and the length of the forearm. Proper measurements are essential to ensure a snug but comfortable fit, which is crucial for the effectiveness of the sleeve in providing support or compression.

Measuring tape is flexible and can easily conform to the contours of the arm, making it ideal for this type of fitting. This ensures that the sleeve will not be too tight, which could restrict blood circulation or movement, nor too loose, which would negate its supportive function.

In contrast, a goniometer is primarily used to measure the range of motion in a joint rather than fabric or circumferential measurements. ML calipers are designed for measuring widths and are not suitable for fitting garments that need to accommodate varying circumferences. The Brannock device is specifically designed for measuring foot size, making it irrelevant in the context of fitting an elbow sleeve. Thus, the measuring tape stands out as the most appropriate tool for this task.