Which of the following should be considered when selecting an accessory SWR meter?

SWR meters are designed to operate within specific frequency ranges and handle specific maximum power limits. For example, a meter designed for High Frequency (HF) signals might not provide accurate readings for Very High Frequency (VHF) signals, and putting 100 watts through a meter rated for only 10 watts will likely destroy its internal components. The distractors are incorrect because an SWR meter merely measures the mismatch; it does not 'compensate' for or fix a poor transmission line match. Additionally, while the meter's location on the feed line can slightly affect the reading due to line losses, the physical distance from the antenna is not a specification you look for when purchasing the meter.