The Fluke IRR1-SOL Irradiance Meter has a built-in inclination sensor that lets you know the roof or solar panel tilt when surveying, installing or adjusting the installation. + Simply place the Irradiance Meter directly onto the solar panel to get accurate tilt. + For surfaces of rooftops with inclinations different than 0°, place the meter on the ground and push the ZERO button for 2 seconds to reset the angle. + Then, measure the true inclination of the solar panel. Get 4 critical photovoltaic measurements in one easy-to-use tool when surveying, installing or adjusting your solar installation. Visit Fluke.com to find out more. Learn more about the Fluke IRR1-SOL Irradiance Meter: https://comtest.co.za/product/fluke-flk-irr1-sol