Final answer:
The best time for the nurse to explain the proper use of the self-monitoring blood glucose machine to the client is on admission to the hospital.
Step-by-step explanation:
The best time for the nurse to explain the proper use of the self-monitoring blood glucose machine to the client is on admission to the hospital. By providing the client with this information early on, the nurse can ensure that the client understands how to use the machine correctly and can start monitoring their blood glucose levels as soon as possible. This will help the client better manage their diabetes and make informed decisions about their treatment.