The trick to something like this getting a halfway decent price is getting the message across that it's a "turn-key" stand, complete, and 100% functional, along with assurance of liberal return policy.
This is a good point. Emphasis should be placed that this is not an overpriced potentially dodgy "comes from a working lab"
microscope sold by an auction reseller but one from a good home.
Examples of the quality images that it is capable of producing will also help, as will a detailed explanation of how simple it will be for the new owner to connect their camera to it if it is a Nikon, and perhaps a photo or link showing what exactly is needed for other brands.
In other words you need to be selling "peace of mind" as well.
On a more prosaic level some mention of what the microscope is worth as parts might encourage the bargain hunter that resides in all of us.