A mechatronics engineer works to automate the transfer of materials and goods, and the manufacturing process. Their tasks involve identifying areas for task automation, designing, developing and testing potential mechatronic devices, and implementing design solutions.
A typical tea bag has somewhere between a gram and two grams of stuff in it. If the entire contents were nothing but fructose, and that fructose completely dissolved when you made your tea, you'd consume between 4 and 8 calories (carbohydrates contain 4 calories per gram) per cup of tea -- so that's the ceiling.
There is still a small amount of caffeine in most decaffeinated teas unless the product is highly processed. Decaffeinated Black Tea can contain about 4-6mg of caffeine per tea bag. Decaffeinated Green Tea can contain about 2-4mg of caffeine per tea bag. Tea quality and steep time will also influence the amount of caffeine in decaffeinated tea. The Journal of Food Science independently tested Stash Premium Decaffeinated Green Tea and found that it contained 7.6mg of caffeine per 2 grams of tea leaves.