I am having trouble hearing anything from your tuning forks. Am I doing something wrong or is it malfunctioning?

ADC’s tuning forks are American made to the highest medical grade standards and accurate to within 5% of the rated frequency. The best way to activate the fork is by striking it firmly (but not with too much force) on a rigid surface. Snapping the tips of the fork prongs together with the fingers will also start them vibrating but probably at a lower volume. Striking the fork against the palm of the hand or any padded surface will dampen vibrations and is not recommended.