1000 grit is more for cheap beaters/damaged edges etc - although I tend to use it regularly to keep the stones flat (rub them on each other).
I had purchased this stone from De https://www.fine-tools.com/kombischleifstein.html
313264 Japanese Combination Stone small Grit 1000/3000 Size 175 x 55 x 25 mm NANIWA HOME STONE
NANIWA Combination Stone small
Economical Stone Series
Grain size: 1000/3000
for sharpening and honing. This is an ideal beginner's stone.
Size: 175 mm x 55 mm x 25 mm