Maybe you real bakers out there have a very good eye for tablespoons and teaspoons, but many of us have no clue what we are doing, often resorting to using measuring cups or worse - trying to eyeball it. I love any kitchen tool that makes cooking easier for me to understand. These measuring devices definitely make cooking much easier. These will adjust to help you choose whatever measurement you need. You only need these two to pretty much do anything involving teaspoons and tablespoons.
If you’re kitchen inept, this might help you navigate the kitchen, if only slightly. You have no excuse for ruining your cookies now, unless of course you confuse the salt for sugar. I’ve made that mistake a couple times, but lucky for me I love a salty cookie. What? Is that weird?