SpectraPen SP 110 Photon Systems Instruments Categories Crops , Photosynthesis, Chlorophyll & Respiration Brochure Send Enquiry Overview PSI SpectraPen SP 100 a handheld, programmable spectrophotometer that provides instant readings and spectral lines on interactive touch screen. Applications include visible light source testing, color measurement and chemical measurement. Back Our Related Products Skye Instruments Skye New Multi-Spectral Radiometers Learn More Photon Systems Instruments Handy GFPCam FC 1000-H/GFP Learn More Regent Instruments WinDENDRO Learn More OptiSciences GFL-1a Learn More