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Using a specific rectal thermometer is the proper technique when measuring a rectal temperature because rectal thermometers are designed for this particular purpose, ensuring accuracy and minimizing the risk of injury or discomfort. They are typically constructed with rounded tips and have specific markings or features that denote safe insertion lengths.

This specialized design allows for reliable readings, as rectal temperatures can provide a more accurate reflection of core body temperature compared to oral or axillary measurements, especially in certain populations such as infants and those who may be unable to keep an oral thermometer in place. Using a regular thermometer could lead to inaccuracies or even damage to the device, as they are not specifically made for rectal use.

Additionally, other choices reflect incorrect practices: inserting the thermometer only about an inch may not provide an accurate reading, and having the patient hold the thermometer is not advisable for safety and accuracy; instead, the healthcare provider should ensure it is securely placed while they monitor the reading.