Suncalc, Sunlight Calculator, Measures The Amount Of Accumulated Sunlight That Falls On A Specific Garden Location, Patented Electronic Process Provides The Ability To Match A Plants Light Requirements, Full Or Partial Sun, Partial Shade Or Shade, With The Actual Sunlight Conditions, Accurately Measure The Amount Of Photosynthetically Active Light In A Specific Growing Location, No Consumables, Meter May Be Used Repeatedly.