Onion and cheeks cell photos with micrometer slide

I was delighted to find this but it would be improved by 1) the 'graticule' slides are actually photos of the micrometer slide at different magnifications, as is evidenced by the fact that it gets larger as the magnification increases. The graticule is ANOTHER item which stays in the eyepiece so the size of its scale does not change. The way the two work together is that the graticule is placed in the eyepiece and used as an arbitrary scale to determine at each power how long each graticule unit is, by comparing it with the micrometer slide. 2) It would be absolutely wonderful if you could do more micrometer slide photos with the graticule in place so students could do this calculation. 3) If you could then have a selection of photos of various microscope slides with only the graticule in place so students could calculate thew length/width of cell parts that would also be very gratefully received!

great resource thank you