Looking to get a microscope can anyone advise

[Ruary]

To second what Nellie said,
Decide what you want to do with the microscope first. Acarine detection needs a stereo dissecting microscope.
The other diseases require a compond microscope:
Nosema spores need no more than X400 for normal use. Pollen using Sawyers data table is reliant on X400 with the occasional foray into X600. Serious pollen analysis goes up to X1000 and uses very strong chemicals to expose the exine.
Bacterias (AFB; EFB etc) require X1000.
If you are going to use the microscopes a lot, then binocular compund is easier on the eyes. If you have astigmatism (as I do) you really need to get eyepieces which allow of their use. (They are called high eyepoint have a spectacle symbol on the side with the magnification markings).
Not all microscopes give the same clarity Randy Oliver tried several before he found the best one (for him) for nosema checking.
If you are going to do a lot of photography then a tri-ocular microscope comes in handy. I am just using a compact digital camera clamped to the ordinary eyepiece and though awkward it does a very satisfactory job. If you are doing photos then you do need plan objectives, certainly for the X40 and larger ones or else jst take the centre of the field.
Hope this helps
Ruary