Sensitive Altimeter. This Android application measures air pressure using internal barometric sensor in the portable device and displays it on a three-pointer altitude indicator similar to the altimeter gauge in aircraft. Digital indication is also available.
It can take a long time. Some employers move very quickly, and others move very slowly. People have been hired three hours or three months (or more) after interviewing. Moreover, hiring nearly always takes longer than employers expect it will; you should generally double or triple whatever timeline they give you.
Then, you wait to see if you will be selected for a job interview. Then you wait for the interview that is probably a week away. Then, on the day of the interview, you're nervous and worried and still waiting because the interview's at 3 p.m. I feel a lot of sympathy for your plight.