RuuviTag sensor is a high quality open source hardware product from Finland.

Measures Temperature, relative air humidity, barometric pressure and movement
Battery CR2477 (user replaceable), life multiple years
Outdoor usage Yes, IP67 rating

Purchase RuuviTags directly from Ruuvi Shop with world-wide shipping. Single RuuviTag sensor pricing starts from 29 €.

This sensor has a user updatable firmware. Meazurem supports for v3 and v5 firmware versions. Version 5 is recommended because it reports the motion information and has better battery life.

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