Made by Luster Leaf-Rapitest, How many hours of sunlight does your garden really receive? Have you ever purchased a beautiful plant or flat of flowers at the garden center, brought it home and planted it, only to have it shrivel up in the following of weeks, because what you thought was a partially shady area is actually partially sunny? And what is the difference between the two anyway? The Sun Analyzer is designed to measure how sunny, or how shady, individual garden locations are. Terms like ful sun, shade and partial shade finally make sense when converted to measurable numbers. Complete instructions on how to use the meter and light preferences for over 500 plants are included inside.