TUNING FORK 256HZ, 288HZ, 320HZ, 341.3HZ, 384HZ, 426.6HZ, 480HZ, 512HZ TUNING FORKThis instrument is provided for middle ... instrument are as follows: 256HZ, 288HZ, 320HZ, 341.3HZ,384HZ, 426.6HZ, 480HZ, 512HZThe frequencies of the thirteen-tuning-fork instrument ... .6HZ, 288HZ, 300HZ, 320HZ, 341.3HZ, 355.5HZ, 384HZ, 400HZ, 426.6HZ, 444.4HZ, 480HZ, 512HZ Educational TUNING FORK