When I [bought my
#Tieguanyin](
https://pixelfed.social/p/zhang.dianli/609211550669017410) I got with it a by-now-stereotypical free
#gift. (
#Taobao vendors almost always throw in a free gift when you buy things. These gifts generally fall into three categories: other products from the vendor as an enticement to buy more from them, useful supplemental gear for the product, or dead stock they're trying to get rid of.) The free gift this time was a steel
#thermos bottle. I have about ten thousand of these things littering my apartment so I didn't pay any attention to it.
Eventually, though, I opened the box and started cleaning it (flushing it with boiling water, etc.) and got it ready for a test of its ability. (A lot of these are cheap junk that barely keep things warm for an hour, and given that this was a free gift attached to a middling grade tea.
I nearly dropped it when I put the lid on it for the insulation test and found the lid glowing at me.
The **free gift** for some mid-grade tea was a steel thermos that monitors temperature. It's triggered by covering the top with your hand for under a second and displays the temperature (in ℃) along with a little colour-coded water drop (red means this temperature can injure you, green means safe).
As a thermos it's decent. Water that starts at 97℃ post-pouring (and waiting for the temperature sensor to react: it takes a few minutes to keep up) will fall down to about 90℃ in an hour or so. Overnight (8-9 hours) it dropped to 65℃ and after 24 hours it was still 38℃.
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