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 Q-teach Plant CO2 Package Learn More Soil Moisture Plant Water Status Console Learn More Soil Moisture G4 Series Grommets Learn More Photon Systems Instruments PolyPen RP 410 Learn More