To answer what this is, infrared is everything above 700nm until 10,000,000nm, ultraviolet is from 10 to 400nm. So with an advertised range of 325-1020 it is a visible light spectrometer that will also include partial IR and UV spectra. Compared to the arenal used by some of our advertisers, this is somewhat limited, but offers an inexpensive starting point that increases the difficulty level of those trying to rip people off. You wouldn't just be able to stick salt in a bottle and call it peptides. To get an idea of how accurate this could be, consider all the different colors of white you are able to detect when looking at your bulk supplements. HMB has a different color of white than say, taurine and so on. This will be a high performance digital analysis of those differences which would then be compared to spectra from other labs, colleges, and government organizations using software.
What will happen is it will return a list of probable results based on the nearness of the spectra. If the first one is what you thought you bought at a high percentage match, that's probably what it is. Having more methods such as vaporizing it or bouncing other spectrums of radiofrequency off of it or through it will give you further certainty. For instance, if you test something and get a near match in the spectra but it has a boiling point of 300C instead of 200C at standard temperature and atmospheric pressure, then you know it's not what you bought and you got tricked. So the question is, how expensive is it to fake the product as opposed to making or obtaining the real thing?
Is a research chemical company really selling to researchers or just biohackers, patients, and self health enthusiasts who want more than modern medicine is able to provide? It helps to know who else is buying it, and testing with something like this will ensure that they don't have a real version for labs and a fake version for everyone else. Most research chemical companies will send you a notice that their product is not intended for human consumption and that by receiving the product you agree not to give it to humans. I would assume this is for legal protection as labs need materials that could be used in humans, otherwise their work would be less likely to translate to humans or be more likely to give complicated results from impurities. The difference comes down to whether or not the research lab buys an insurance policy for the research when they use it in humans in case something goes wrong.