iButton

Can be purchased through Thermochron or Amazon.

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You can buy this tool from Thermochron. The anticipated price range is $21 - $50.

About this tool
Description

Temperature logger. Collects air temperature. Examples of uses: research, transport, room temperature monitoring. Needs additional data reader to download information onto a computer.
Size & weight Flat: This tool would fit in an envelope.
Less than 13oz (a full soda can weighs a little less than 13oz)
Expected lifetime Should last at least a year
Tool updated Jan. 3, 2019, 7:26 p.m.