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 Rover FC 900-R Learn More Photon Systems Instruments Submersible FL 3500/SM Learn More Soil Moisture G4 Brass Support Washers Learn More Qubit Systems Q-Box CO650 Plant CO2 Analysis Learn More