Unfortunately when I google the answer, the results are just how to use a balloon to measure air pressure. I want to be able to monitor the internal pressure of a balloon using a digital barometer. 1) How would I go about setting up such a system? 2) Would the barometer have to be on the inside of the balloon or are there ways of measuring the air pressure inside by letting out some air? 3) What type of digital barometer should I use? 4) What is the typical air pressure of a balloon?