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.
These days, most managers have some (or even all) of their staff involved in the selection process, so the hiring manager needs to get feedback from the staff. This means that it normally takes a minimum of a week to put together a job offer, and depending on schedules and travel it can take longer than that. I generally don't write off an employer until 2 weeks after the interview.