I bought this gadget primarily for jam making. What the description doesn't tell you - and is quite important - is that it WILL NOT WORK on an induction hob. The packaging, however, does tell you this. I ordered it and couldn't stop the alarm constantly going off every few seconds when it was placed in the pan. There is nothing in the manual to tell you what this problem is, but on checking the packaging it clearly states that it is not suitable for use on induction hobs. Would have been handy information to have read BEFORE I bought it. Amazon - you should make this point clearer in the item description.