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 PP Systems SRC-2 Soil Respiration Chamber Learn More Soil Moisture G4 Stem Sleeve Sealing Kit Learn More PP Systems EGM-5 Portable CO2 Gas Analyzer Learn More Photon Systems Instruments Micro-FluorCam FC 2000 Learn More