300 bar max-indicating gauge

I am looking for an injector tester or a 300 bar or 3000 psi minimum max-indivating gauge. I am looking for something on the cheap or reasonably priced at the least.

What kind of accuracy?
Here’s one on ebay for $16.50.

Greater than 1% accuracy.
I’m looking for a max-indicating gauge. What did you put in for a search term? I will look some more tomorrow.
Thanks