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Message: <blockquote data-quote="Blitzfike" data-source="post: 2761636" data-attributes="member: 807">The angle of the sun with respect to the sensors plays a big part in how well your session goes. The sensors detect the shadow of the bullet as it interferes with the sunlight being detected, and on cloudy days or if you have the sun at a low angle, you won't have very good results. The Pact unit I have has the infrared screens and it did very well in any light conditions, but the brains of the unit are having issues and until I can get it repaired, it sits on the shelf. It also requires a battery to power the screens.As you enjoy your first session with what ever brand of Chronograph you get, at setup, either place your gun in a rest as it will be when shot, or get someone to hold it in position and stand behind the shooting position about 5 feet and look at the bullet path to make sure the rifle, screens and target are properly aligned. Don't forget the offset for the amount the scope is above the barrel if shooting a scoped weapon. Things might look clear through the scope and have the bore aligned with the unit. I lost a sensor on my first chronograph when a friend shot the top off of it. Fortunately, it only took a piece of lexan to replace the damaged part and it worked as good as new.</blockquote>