what is a ceptometer
AccuPAR Ceptometer model LP-80. The AccuPAR model LP-80 is a lightweight, portable, linear photosynthetically active radiation (PAR) sensor. It lets you measure canopy PAR interception and calculate leaf area index (LAI) at any location within a plant or forest canopy. The AccuPAR weighs a little over 1 pound (0.5kg).