Today we are taking a look at Premium Aquatics Refractometer with LED light. We are going to take a quick look at this refractometer and see how it operates and how to calibrate a refractometer. Enter to win: 1. Watch video and hit Thumbs up 2. Subscribe if you haven't already to our channel 3. Post a comment on the YT video page. Premium Aquatics Lighted LED Salinity Refractometer This model includes an LED lighted lens cover. https://pafish.me/2rsD975 So you no longer need to take your refractometer to a bright room or outside to see the scale. Just push down on the LED tab and lights up your scale to easy take a reading, even in a completely dark room. We also include an additional standard ring and lens cover. So if you ever decide you want to change from the LED to a standard, you just easily remove the ring and cover and swap out.