To calibrate the device, [Sergei] made a second hand-held unit that he could (presumably ... But the star of the show, that lets the anemometer spin effortlessly, is the sweet bearing that ...

The M130 Mini Anemometer has been added to the M-Series of mini handheld environmental meters. The instrument measures air speed up to 55 mph (90 km/h) and temperature in a range of -4°~122°F ...