How to use Estes Altimeter?

How to use the Altimeter? Turn on the altimeter using the side button. The screen will display 0. Press the small black button on the front to change modes. To reset and get ready for the next flight hold until 0000. Unit is for changing the units between feet and meters. Reco is for looking at previous flight data. Let Go of the black button and click to go between different flights. Clear is for clearing all of the flight data. How to test the Altimeter? Put a bottle Get vacuum cleaner Use the pipe on the side to suck out air from the bottle. Put altimeter in. Use vacuum cleaner pipe to suck more air out. Wait a few seconds. Take Altimeter out of the bottle. You should see some numbers.