Mask adhesion determination device

A method for using a mask fitting level determination device, comprising:

• inserting a mask inner pressure detection unit between a mask that covers a mouth and a nose and a face surface of a wearing person;
• measuring pressure value inside the mask with the mask inner pressure detection unit;
• using a circuit control unit to derive determination information from a measurement result of the pressure value;
• generating display information for the wearing person based on the circuit control unit;
• showing the wearing person the display information on a determination display unit;
• activating a start switch to start a mask inner pressure detection operation;
• and
• showing at least one of good fitting display units and bad fitting display units on the display information on the determination display unit shows;
• wherein the good fitting display units being activated when a difference in variation of a mask inner pressure in a trial time required for mask fitting level determination is equal to or greater than prescribed threshold values, and the bad fitting display unit is activated when the difference in variation is less than the prescribed threshold values;
• providing a plurality of good fitting display units on the basis of the plurality of prescribed threshold values set in a stepwise manner in accordance with fitting levels;
• and
• turning on the plurality of good fitting display units in accordance with a stage of the prescribed threshold values.