Use CDN's Multi-Mount Oven Thermometer to monitor your oven's exact temperature.
A high quality magnet lets you mount it on the side walls of the oven, out of the way of racks or large items but It can also be hung from a rack by its hook or set on a rack with its tilt-down stand. Temperatures can be sampled from different parts of the oven to check for hot and cool spots.

Stainless steel housing with glass lens
Ovenproof
Magnetic, hang, or stand mount
Measures from 38°C to 315°C/ 100°F to 600°F