KC KTF500 音叉の高価買取価格

The item you're referring to seems to be a tuning fork with the model number KC KTF500, which is tuned to the pitch A at 440 Hz. Tuning forks are commonly used by musicians and music teachers to provide a standard reference pitch for tuning instruments.
The specific frequency of 440 Hz corresponds to the musical note A above middle C and is widely used as a tuning standard. If you have any specific questions about this tuning fork or need additional information, feel free to ask!