The 5 liter beer cooler/heater was $35 and the USB fan was $10.
It goes from 12c to 57c. Maybe some people like hot beer.
It needs the fan. All the hot and cold is in the back.
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We have a giant enviro chamber in the basement, but it's a nuisance to haul a bunch of test equipment down there. This goes right on my bench.
John Larkin Highland Tech Glen Canyon Design Center Lunatic Fringe Electronics