The Pyranometer measures the power of electromagnetic radiation. It is sensitive to near infrared, visible, and UV radiation, where 90% of solar energy is concentrated. It reads in watts per square meter, so it is great for experiments with solar cells and calculating their efficiency. Included are: Vernier Pyranometer Pyranometer lens cover Instruction Manual **This item requires the use of a LabQuest computer interface which is also available for checkout. Click the checkout tab to check this item out.