@Torsten Thank you. My Dad started teaching me how to cook at the age of five on my birthday in 1975 with pancakes, I have been a serious home gourmet since, and even used to cook for a living, these are my most prized possessions.
My calibratable oven thermometer.
My digital kitchen scales and their calibration weights. A 50g for creating seasonings, a 500g for general use, a 2Kg for heavier ingredients, and a large platform 5Kg for bigger bowls.