Hi Peter,I’d previously seen this which seems to suggest there’s a difference:https://youtu.be/6EbG39cXRAk
I must admit that the resemblance is uncanny...
The price quoted in the Alibaba link is for a minimum order of 1,000 units - so at least some of the difference is the normal effect of bulk buying.
The Wright brothers appeared on an episode of the Kodakery podcast. And the end they discuss the modifications they needed to make to the general sous vide device. Have a listen as it is quite an entertaining and insightful story they tell.https://www.kodak.com/corp/podcast/podcastepisode/?contentid=4295014282