Cheap water thermometer from China

At 18:11:14 I have 8 of these beszellt Billigstteilen.
At 02:01:15 they came with the label "of customs treatment freed" on.
How much of the delivery period therefore accounted for the "liberation", I can not say.

Ok, we pack one out for testing. The first (and only) Schreck: Both coin cells were discolored blackish and in the mini bag was white powder to see.
The other seven controlled, everything ok

So used the coin-cell with a thermometer and and hung in a container in which already hung a much more expensive thermometer. Result: It works, difference 0.3 degrees.

For me, a surprisingly good result. For the price (and the minimal shipping and handling) a perfect part.
Who laboratory accuracy expected: There's not blame the part, but he himself.
Should show the use of the other 7 significantly different results, I write it yet.