The ability to block solar energy is a key performance criteria for windows. Implement the CRL SP1065 Digital BTU Solar Meter into your sales presentation and educate your customer on the solar performance of your window. The SP1065 is a durable and compact meter that has excellent resolution. The meter is powered by a 9 volt battery and includes a digital display that shows continual solar measurements. The meter is extremely simple to use: Just turn on the meter and start taking readings. There are no cumbersome adjustments needed. You can take readings using the sun, or for indoor settings you can use our Infrared Heat Lamp. The SP1065 does a great job of showing your customer the benefits of energy-saving Low-e coatings, especially high performance spectral selective coatings.