Get a digital scale for science labs.

I know how expensive tools are for science.  One essential tool is an electronic balance.  My bigger one had died during our recent move.  So sad!  I was digging in the basement through bins, searching for the ring stand.  I had packed all of my science equipment and labeled everything.  My husband, Rob, didn't like how I had packed.  He repacked everything in the garage and labeled the bins: Science Camp.  Every. single. one.  Rob isn't that into science.  I've had to scour every bin to locate equipment; Chemistry is mixed with Biology, etc.  So, when I was scouting for the ring stand and extra rulers, I chanced on my miniature, digital scale, perfect for weighing hot wheels cars, density blocks, and marbles.  How do I know it's accurate?  I used the density blocks; there are instructions for calibrating the scale; but, I don't have a 500 gram calibrating weight.  The digital scale I bought from Amazon was under $10 and weighs up to 600 grams.  I used it before for Chemistry to weight small samples.  Use a cupcake paper as weigh paper.  I know!  I just weighed the block directly on the scale!  Okay, cars and marbles can be placed right on the scale and weighed.