This can be placed inside an oven to measure the internal temperature. It's convenient for making bread and sweets. External dimensions: 70 x 85 x 33mm (depth) Materials: Stainless steel, heat-resistant glass Maximum measurable temperature: 300 degrees Celsius Used only twice, but there is some brown discoloration on the bottom. There are no problems with its use. Please feel free to contact us if you have any questions. :)