Refer to the following simple manuals for the measurement methods used by heat stroke checkers.

・Click here for the WBGT-203.
(https://www.kem.kyoto/wp-content/uploads/sites/2/2021/03/wbgt203om.pdf)
・Click here for the WBGT-213.
(https://www.kem.kyoto/wp-content/uploads/sites/2/2021/03/wbgt213om.pdf)

During measurement, position it so that the center of the heat stroke checker’s black sphere is 1.2 to 1.5 m in height above the ground.
When measuring outdoors, be careful that the heat stroke checker is not positioned in a shadow.