One of the hardest food products to accurately measure the temperature of are sandwiches. This is because the product itself is sealed within a plastic container that has a fair amount of air in it - air is one of the best insulators (which is why it is incorporated in double glazing), but having so much air within the packaging makes it difficult to measure the sandwich temperture. This is where a between pack probe should be used. A between pack probe is a very thin and usually flexible sensor that can be 'sandwiched' (sorry, couldn't resist the pun), between the packs of sandwiches you want to measure. Best if left in situ for a minute before taking the temperature to allow the probe to come down to the true product temperature.
Ovens and Hotplate Temperatures The main consideration here is that they are hot! So, one of the areas to watch out for is the fact that the cable might melt if it is trapped within the oven door, or rests on the hotplate. A way around this problem is to use a probe with a teflon sheathed cable which can withstand higher temperatures.
