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 Photon Systems Instruments Arch FC 900-A Learn More Spectrum Technologies IPM Scope CAM2 Learn More Spectrum Technologies Handheld Refractometers Learn More Photon Systems Instruments PlantPen PRI 200 & NDVI 300 Learn More