You will need to acquire the ability to count clicks in addition to seconds. For a quick and easy measurement, simply push for a moment and switch the device on. If you push the button a second time, it will begin measuring even though nothing will be displayed on the screen. If you hit the button a third time, it will display the result. To obtain a measurement, briefly press. Press the button for a continuous measurement for one and a half seconds. Holding down the button for three seconds will shift the reference point mode to either the beginning or the end of the device. To turn it off, press and hold for five seconds. The most important thing is to not cause confusion:)