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 Qubit Systems S129 Methane Analyzer 500ppm Learn More Skye Instruments PAR Sensors Learn More Photon Systems Instruments SpectraPen SP 110 Learn More PP Systems EGM-5 Portable CO2 Gas Analyzer Learn More