I would get something like this. https://www.amazon.com/dp/B0899GZ3WR?tag=slickdeals09-20&ascsubtag=d4c6637431e011ecb9e87eba4bb8dbe80INT
There are coupons as of 10/20/21 that brings this down to $240.
Didn't you buy this used from his classified section?
I know DOC sells these timing labels. https://docsdetecting.com/product/soil-timing-labels-2-primarily-for-gpx4800-and-gpx5000/