Ultrasound calibration can only occur if the output is measured using a high‐precision ultrasound watt meter. The output is sampled at various levels and compared to the machine’s output meter indication. If the difference between the meter indication and the actual measured output is within ±20% (industry standard), the device is operating satisfactorily. Kowalski Calibration endeavors to provide a ±10% tolerance on adjustable ultrasound devices (note: not all models allow for service adjustment). We have found that by adhering to a ±10% tolerance, the natural changes that take place to the physical properties of the crystal are less likely to create dangerous out‐of‐tolerance conditions over the course of the following year. Other devices requiring annual calibration are traction units and hand testing instruments.