These vessels, which are generally bottle-shaped, are often fitted with a nasal or adhesive seal. Important measuring parameters are the front axis to the nasal acid parameter, the neck to the body, and the wall thickness. The gap is in the middle range, so the level of measurement inaccuracy is somewhat low. The requirements for measurement time are also generally not strict. The nasal shape and the patch seal are directly related to the seal seal tightness and secrecy, so optical and contact multiplexing and chromatic focus sensors can measure the shape in a stable manner, even when used in a patient's condition.
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