Balance Regulating Tool / Balance Wheel Timing Tool for Audemars Piguet 3120 /3126 / 3090

A specialized precision tool designed for professional watchmakers servicing Audemars Piguet movements. The balance regulating tool engages the regulating screws or inertia weights on the balance wheel, allowing precise adjustments to the wheel's moment of inertia to fine-tune rate performance—making your watch run faster or slower as needed. Compatible with AP 3120, 3126, and 3090 calibers. This is a precision instrument requiring expert handling; incorrect adjustments can compromise balance-wheel poise or damage delicate movement components. For experienced professionals only.