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.
Send the message immediately after the interview, definitely within the first 24 hours, even if the interview was on a Friday. Make the Subject short and specific to the job you interviewed for (see the sample below), and be sure to include both the job title and the phrase thank you..