How much is 2 pounds of potatoes or whatever - do you use a scale?

[progree]

For an accurate recipe, when something calls for 2 pounds of potatoes, I want to be in the ballpark.

If you use a scale, do you find it to be accurate (e.g. weigh a quart of water (32 fluid ounces) or some other amount and compare its weight to what it should weigh, after subtracting off the container's weight, namely 32 ounces = 2 pounds).

Do you bring a calculator to the kitchen to subtract the container's weight? Sigh.

And how do you determine the container's weight except by using the scale whose accuracy you are questioning?

Edit: I see Amazon has a bunch of food scales from $10 to $30 and plenty that are higher cost.
https://www.amazon.com/s?k=scale+for+foods

EDIT - this is a generic question, I'm not just interested in weighing potatoes, but ultimately weighing a variety of foods.