The palpeur is calibrated in grams of pressure. The calibration refers halfway of the spring.
It is used in the research of auricular points based on the patient's reaction to pain, usually signaled by the typical grimace.
The upper end is used in the search of the reliefs cartilaginous, landmarks.
Blue - 250 grams of pressure
Black - 130 grams of pressure
Orange - 400 grams of pressure