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 Spectrum Technologies LightScout Quantum Meters Learn More Qubit Systems S101 Diffusion O2 Sensor Learn More Photon Systems Instruments OxyCorder 401 Learn More Photon Systems Instruments Submersible FL 3500/SM Learn More