EISCO Premium Quantitative Spectroscope - 400-700nm Range, 5nm Accuracy

The instrument is fully functional; however, it was mailed in a flimsy envelope and was cracked. Amazon replaced the item without needing the cracked one to be returned. Try this with a Tesla coil!

I bought this prior to doing my own experiments with gratings I have purchased. It is kind of fun to compare old compact fluorescents with their peaky spectrums to more modern LED's and their more continuous spectra. The slit is pretty wide so I tightened it up with some black electrical tape. This made the spectrum fainter so it required brighter light, but the lines are narrower and crisper. The pic I shared is a compact fluorescent with the tighter slit.The 405 and 436 nm mercury lines are in the right place on my unit, but the bright green from mercury should be at ~546. There should be a twin peak at 577 and 579 due to mercury, but there appears to be a lot more going on in this lamp. I found that Fluorescents have other elements Terbium and Europium. Terbium makes the broad cyan peak at 487 nm and europium a bright red peak at 611nm. You can see that the scale on my unit shows this last peak at just below 600nm so it is off by at least 12nm by this end of the scale. Still great fun!Of note, older (40-50+) and/or farsighted users will not be able to view the scale in focus, but younger users should have no problem. Have fun!

Grandson wants to be a 'quantum guy' so this is useful. He isn't making measurements with this but does see qualitative comparisons with several light sources. I bought him a green laser pointer with a front set of crossed diffraction gratings for projection. These two provide endless experimentation. We need more educational kit like these.

Decent item for what you pay. When it comes to items like this you get what you pay for. This is a cheaply made but assumed to be accurate instrument capable of detecting the wavelength of light. You have to angle the instrument just right and look through the viewing hole to get an accurate reading. Overall though decent.

This is essentially the same spectroscope that I used in chemistry class to observe various light bulbs and burning chemicals. I am using it to test filters to see the wavelengths of light that they allow to pass. It works as expected. I really appreciate that the nanometer scale is so accurate. I tested its accuracy with a fluorescent bulb and a green laser (indirectly). See the attached images that show the respective wavelength patterns. I took the pictures by just placing my cell phone camera over the eye hole. This spectroscope is simple to use and seems durable.

This is a very solid/sound product. I've had no issues with the build quality. The accuracy, however, leaves some to be desired, especially in the laboratory setting. For laboratory use, I would recommend a computerized version, although the price range will be significantly higher. For classroom use, it works great. I can definitely envision a lab assignment being created around this item.

This does not work. Any light source you point it at it will display the full color spectrum, no variation. Completely useless for determining the wavelengths of light.

It works great! Shows exactly the wavelength range of the light it's pointed at. Make sure all other lights except the one you are testing are turned off to get the most accurate reading. I used this for testing lights that I use in my photography darkroom. I also used it for making custom grow lights. It works great for the price.