These inexpensive LCD temperature strips work fine inside a vacuum chamber!
"Reversible Temperature Labels, Multi Temp Liquid Crystal Strips"
"RLC-60-90/120-10 In Stock $13.00 16 Temperature Levels Label, 90 to 120°F/32 to 49°C (2°F increments) in package of 10"
http://www.omega.com/pptst/RLC-60.html
I included the details and link as this may be the sole source.
I suppose with a vacuum oven you could stick them right on the dish.
"Reversible Temperature Labels, Multi Temp Liquid Crystal Strips"
"RLC-60-90/120-10 In Stock $13.00 16 Temperature Levels Label, 90 to 120°F/32 to 49°C (2°F increments) in package of 10"
http://www.omega.com/pptst/RLC-60.html
I included the details and link as this may be the sole source.
I suppose with a vacuum oven you could stick them right on the dish.