Installation of optical consumer network terminals for Ziply Fiber. This thing is very useful. The light meter seems accurate and works well as far as I can tell. The Category 5 tester is great because I don't have one and I love how it feels to hold this device in my hands so it's good to use it elsewhere. In fact, it is comfortable to hold in the hands, it has a comfortable weight and texture. It also has a flashlight, pretty cool to see in the hub. The black cap on top covering the light meter lens is awesome. Holds up well and is well made. I can't imagine using a visual flaw detector (laser) on it as I have a laser that I leave at home when I go downtown. I need a light meter on the hub to make sure my pair is lit and not damaged. The serial number is worn off on the back and I've only had it for about a month. Barker, but I just love my exposure meter with a Category 5 tester.