This APP is an infrared application of taking forehead temperature, it must be used with an infrared thermometer TMS ( please refer to http://www.radiantek.com.tw/products/tms.asp ).
TMS with phone jack plug can be connected with the phone jack of iPhone , and then use the APP to take temperature. Make the thermometer within 1 cm from the central forehead and press the "SCAN" button on the screen of iPhone to get the forehead measurement. The time consuming for measurement might be 1 second.