We purchased this from a business closing sale. It sat in their storage area and never got used before they closed up. We also have an ad for a Hand Held Refractometer, we can combine shipping if you buy both.It's a little dirty from them just testing it for a few minutes, but you can easily see that's all it was used. We guarantee it. The length of the belt in your solution is 12" overall belt length is 34" we measure. Just mount to your sump and run a hose to your storage container and start skimming.Make sure this is correct for your machine. We do accept returns but buyer is responsible for shipping.