Hey Bill! Good Q. Mine is 300g and from Tonetech :
The main reason I suggest a sharpening stone is because you may already have one in the shed.
If not it is a little expensive to buy just for the leveling the frets - but the Tonetech is especially good as it is larger than average, wide enough easily to sharpen a plane and appears to last extremely well.
...or...You can make your own with any flat block and 300g sandpaper for 1 time single use.
Measure twice, cut once...