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 CPY-5 Canopy Assimilation Chamber Learn More Hansatech Instruments FMS 2 Chlorophyll Fluorimeter Learn More PP Systems Ciras-4 Portable Photosynthesis System Learn More Photon Systems Instruments Large-Scale Photobioreactors Learn More