Neuro- Tuning Fork for diagnostic diabetic foot

 Neuropathy tuning fork is similar but not identical to the traditional tuning fork because there are two triangular cones in both ends of the tuning fork respectively. There is a black triangular cone
in the left side and a hollow triangle cone in the right side which have calibrations, that is 0 to 8 from bottom to top correspondingly.
When the tuning fork is vibrating, the black triangular cone in the left would turn into two gray triangular cones while the intersecting area would be a small black triangle. And with descending of vibrating, this black triangle peak is arising from bottom to up gradually. Write down the calibration when the patient cannot feel the vibration. The triangular cone in the right also would turn into two triangular cones and while the intersecting area would be a small white triangle. And with descending of vibrating, this white triangle peak is arising from bottom to up gradually. Write down the calibration when the patient cannot feel the vibration.