Review on IVYX Scientific Digital Lab RT100°C by Tim Paolucci

That's exactly what I wanted, namely heating jars with a gelatin solution. I was looking for a cheaper alternative to gluing. It's easy to use. I haven't checked the temperature gauge with a thermocouple so I can't vouch for its accuracy, but it does hold the displayed temperature fairly well. I have a strong impression that this is a converted baby bottle warmer. You can buy them a bit cheaper, but I don't know if they are continuously adjustable between ambient temperature and 100°C or if they have preset temperature points. In any case, the price remains reasonable.