Check the listing for details. DIY Smartphone Spectrometer - Full Pack - Grating Transmission -. Condition: New. Listed at 25.00 USD. This a DIY (Do It Yourself) Spectrometer.It is a project that you have to build yourself. It contains :- Two slits (0.09 and 0.18mm)- Two diffration gratings (500 and 1000 l/mm)- One cupboard to build le body of the spectrometer You have to build the body of the spectrometer with the cupboard (hard paper) you will get in the pack. Install the slit and the grating in the pby), and then attach it to a cellphone or your computer. (their cameras will work as detectors). There is NO dectector, spectrometer, computer or cellphone included in the pack you are paying for. Our DIY Smartphone Spectrometer is based on the PublicLab.org project.Please, cut the black card following the instruction, cut the slit (or attache the one you buy), insert the real high quality linear grating grid.Then attach the DIY Sectrometer to your Cellphone/computer or webcam (or even camera), aquire images, callibrate them ... ans share ... We have done some improvement that makes real difference:- We use a real good quality Transmission Grating - for a Full Pack DIY spectrometer is sold with two slits and both gratings 500 lines/mm and 1000 lines/mm THIS IS A DIY ITEM :it means clearly that YOU HAVE TO DO IT YOURSELF, not WE WILL DO IT FOR YOU.It seems that it is not clear even for an english speaker from the US : ebay ID : USA-MikeSo, please, if you do not understand what you are paying for, or not ready for a DIY item, not buy it, and do not put negative feed backs, like this guy. No Smart Phone or Computer is included in the offer - The improvement we make is that our DIY Spectrometer is sold with freeware software, FROM OUR WEB SITE YOU CAN DOWNLOAD THE SOFTWARE. Software that you can install on your computer and start analyzing your spectra without passing by an upload our download on Internet, you will be independent and free to work whenever and wherever you want. Buying or Full Pack DIY Spectrometer will help you save on the Taxes shipping fees and time! and you’ll get more in quality and options !