At work I have access to a Prova 210 Solar Panel Analyser / I-V curve tracer.
It is a very handy instrument for testing solar panels and analysing their I-V-P curves.
At work I have access to a Solmetric SunEye™ 210 shade analysis tool.
This is lifted from the Solmetric website.
Professional Site Evaluation
The SunEye 210 is an integrated Shade Analysis Tool for solar site assessment. It includes a fisheye camera and a dedicated on-board processor to perform digital image processing and analysis to compute shading and solar access percentages. It includes an electronic compass and inclinometer enabled to measure roof pitch and azimuth.