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 Leaf Area/Root Length Systems Learn More Regent Instruments WinFOLIA Learn More Spectrum Technologies LightScout Silicon Pyranometer Learn More Others CID Portable Laser Leaf Area Meter (CI-202) Learn More