As far as an inexpensive item I use every day, kitchen scale.
It has a lot of functions and can make you a better cook and a healthier person if you choose to use it for such reasons. My main uses for it are weighing coffee and water to brew a really dialed in and consistent coffee brew for me, and one for my girlfriend. No using volumetric scoops that give you different amount of different coffee brands or grind sizes, no eyeballing the amount of water you're using to brew and extract. Find a recipe that works, and you can repeat it every time and get the same great result.
Same for any other recipe. I make a seasoning mix to make killer taco sauce. Add the spice to an empty cup, add x grams ketchup, x grams water, and x grams vinegar...perfect sauce every time. Bread recipe calibrated for my special bread pan. x grams flour, water, salt, and yeast. No guessing, no multiple dirty measuring scoops and cups and spoons, just toss it in one bowl on the scale. Need x amount of honey, but lose half getting it stuck to the spoon or cup? Look at the serving label to get the grams per tsp and just squeeze that amount right into what you're making. You can also do the reverse. Bowl too big to read the scale? Set the bowl aside, tare the scale with the flour container, and scoop out the amount you need.
Want even portions? I make a ball of dough, tare the bowl and toss the dough in. Divide by the number of portions I want. If I want 50g rolls, pull off a ball, adjust so scale reads -50g, tare and repeat. Want to measure out servings to stay healthy? How much is a cup of something lumpy like Brussell sprouts? Look up the serving weight and dish out that much.
If you want something more upscale, I also use my Barratza Encore coffee grinder and Breville Smart Oven every day. Both give very consistent results and have brought real quality of life improvements. The grinder lets me try new single origin fresh coffees every month, and the Smart Oven heats very quickly and cooks more evenly than my standalone oven while using much less electric and not heating the whole house up, plus it rises dough nicely and the air fryer function reheats leftovers wonderfully and toasts bagels more on one side than the other and a bunch of other stuff.