Final answer:
To back up one space or return to a previous menu on the FreeStyle Precision Pro Glucometer, use the backspace, clear, or delete button, labeled with a left arrow or 'back'/'clear'. Consult the user manual for specific instructions.
Step-by-step explanation:
The button you would need to use on the FreeStyle Precision Pro Glucometer to back up one space while entering numbers on the keypad, or to return to a previous menu, is typically a backspace, clear, or delete button. It may be labeled with an arrow pointing left or have a 'back' or 'clear' label.
In case the glucometer's instructions are not clear, you should consult the user manual for your specific device model to understand its functions correctly. Remember, mastering the use of your glucometer is crucial, as modern meters, which can quickly measure blood sugar levels, are essential tools for people with diabetes. If you face difficulties, try experimenting with the button order, but don't give up until you are proficient with your glucometer.