[Scope of Use] This meter is a precision instrument measuring the intensity of sunlight. Widely used for solar radiation measurement, solar energy research, meteorology, agriculture, physical and optical experiments. [Test Glass Performance] It can also be used to measure the light transmission intensity of glass to verify the performance of the glass, for example, car window performance test. [Simple to Use] Measure directly without adjustment, steadily measure for a long period. [Units optional] W/m² and Btu; Range Error: ± (10%R+2dgts); Display: 4-1/2 LCD display, maximum display numerical value 19999; Battery: 9V battery(NOT included) ; Size: Approx. 132 x 60 x 38mm [Rigorous Testing]The solar power tester has undergone rigorous quality assurance testing to ensure dependable and reliable performance, Weight: 0.818355916544 Pounds, Manufacturer: ciciglow