I am new to bread baking, and start collect hardware for making bread. I was given a digital scale, how can tell if it is accurate. I like to weight the ingredients for baking, and is this a good practice
Ten pennies weigh an ounce.
That's the advice given when we purchased our first postage meter and scale by the Pitney Bowes rep and it holds true. I just checked my own digital scale and confirmed it.
"I like to weight the ingredients for baking, and is this a good practice"
It's the only way to go. Bulk measurements in bread making generate a lot of problems, especially for the new baker, and you don't need that frustration.
It doesn't matter if a scale is accurate, as long as it is precise, and is linear. It doesn't matter if 10 pennies weighs 28.3 grams, or 28.5 grams, or even 30 grams, but it needs to weigh the same thing every time (precision). If the 10 pennies weighs 30 grams, 20 pennies should weigh 60 grams (linear).
Since we're using baking percentages, if your scale is precise and linear, you will get the proper percentages, regardless of the scale's accuracy.