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 Hansatech Instruments CL-01 Chlorophyll Meter Learn More Spectrum Technologies LightScout Quantum Light Sensor Learn More Regent Instruments WinDENDRO Learn More Photon Systems Instruments Leaf-Clip FL 3500/LC Learn More