Talking of Aldi... if you have £8.99 to spare, you could invest in an electronic vernier calliper.
They are great for measuring shims, metal body thicknesses, hole diameters, depth of holes, drill diameters and bolt sizes etc.
The accuracy is nearly the same as a micrometer, and with it being digital, a lot easier to read.
They display in imperial or metric, and you can zero it at any position, and measure differences.
I use mine several times a week, just for sizing those drill bits alone...
The only better bargain is to spend another £1.01 for a years membership to this site.:thumb2:thumb2
best regards,
Rustic