Final answer:
The GPS (Global Positioning System) is the appropriate device for making global measurements, as it provides location data on a global scale, unlike barometers and thermometers, which measure atmospheric pressure and temperature respectively.
Step-by-step explanation:
When considering devices suitable for making global measurements, a barometer is used to measure atmospheric pressure and is not designed for global scale measurements. A thermometer measures temperature but also does not provide measurements on a global scale. However, the GPS (Global Positioning System) is designed precisely for global measurement, providing accurate location data anywhere on Earth. Therefore, for global measurements, the most appropriate option is b) GPS (Global Positioning System).