My husband and I are really just getting into this, so are not experts by any means. Anyway, we should have some photos and diary of fecal activities to post after tonight, which may be helpful to some.
We just got in a delivery of 7 wild caught chams and will be doing more fecals this evening. I will take photos and post them with a step by step description, probably tomorrow.
My husband does the fecals. (I do the collecting

.) Our microscope cost over $300 (I think). But, with the number of chams we have, and the "rescues" and WC chams we've purchased, the microscope has probably already paid for itself. We tried craigslist and university classifieds to buy a good used one, but there was nothing available in our area at the time. I will ask my husband and let you know where he ordered the microscope from.
Our microscope hooks up to the computer, so we view the slides on the monitor. We can save photos of the results, and also videotape moving organisms. We use a parasite book, but we put a bunch of photos on a little drive and took it to the vet on Saturday and sat down with him at his computer and he taught us a few additional things. He did that in conjunction with an exam appointment and so it cost us nothing extra for the lesson and advice. Just another idea of what you can do when you have your own. It's definitely not a total DIY project, by any means. We've had a lot of ongoing help from Dave Weldon and others along the way.
With the floats we start at 100x to get an overall view of things. Then bring it down to 400x or greater. Most of our viewing is done at 400x. The sperm video we did of the Melleri Smegma was at 1000x or 2500x.
Here's one reason why we wanted a microscope with camera and computer hookup:
If you have a cham with parasites, and begin treating him, it is nice to do a series of photos of the slides, over a several week period. At 100x the photo gives you a good idea of density of a particular parasite. By comparing the initial photo, to others over the period of treatment, you can determine if the parasites are disappearing, or if the population is at least decreasing by determining how many you see on a 100x view of the slide. This is especially relevant with treatment-resistant parasites such as coccidia, wherein if you can determine that the treatment is not working after 2-4 weeks, it is time to try a different method. Coccidia, of course, are not eradicated by medication. The treatment just hinders their ability to divide, and the cham's immune system has to do the rest. Our male veiled Wolfgang, who was a rescue, has been successfully treated for coccidia. The treatment can cause anorexia, and so we had to force-feed him 3 times to keep his immune system strong.
The photos saved on the computer also give you a clear record of each of your animals fecal history, for future reference.
We haven't done smears yet, but they will show you things the fecal float won't. So we plan to start those, perhaps tonight. I think it is possible to float and smear on the same slide.
And, yes, definitely don't use fecal results as a single determining factor in your cham's health. They can still get bacterial or viral infections, and mineral/vitamin issues, and stress issues, and reproductive issues, etc.
We have a beautiful panther morph from the Kammers, named Pegasus, that changed behavior last week. His fecals were fine. But he was slow and a little listless, though still eating. Friday night I held him up to my ear to hear his breathing and thought I heard a slight clicking sound. When, Satuday morning, he was still asleep hours after the others were awake, and then sat in a weird awkward position for a few hours, we took him to the vet with a possible URI. We should get the results of the bloodwork and culture today. I will post that as well. Bloodwork always interests me, because it can tell you so much about whether you're doing your job feeder-wise. The vet felt Pegasus appeared healthy, but put him on antibiotics just in case.
(Sometimes chams will make that little clicking sound just because they don't want to be picked up. And, sometimes male chams become "lovesick" and act listless and go off their feed for a few days. Especially if they see a female, which he had. But still, we don't like to take chances.) Vet bill: about $248 (mostly because I requested a culture and complete bloodwork). Free parasite lesson from the Vet: worth a bundle more.