There are countless things you need to be aware of if you want to succeed in making your macarons. one of them is you need to prepare an oven thermometer to keep track of the temperature.
Every oven works and heat differently, and whatever you preset on the digital panel may not reflect the actual temperature in the oven. for example, after working my way through, I realized that I need to bake my macarons at 305F, but as soon as I placed the thermometer and checked, the temperature inside was actually 300F only.
This will be an important key to know when you are planning to make your batch in a different oven, because you will need to take the thermometer to test out the temperature before you start baking in a different oven for successful macarons.