As auto enthusiasts ourselves, we wanted to know the quality of fuel we were running and wanted be able to test it accurately. We were frustrated because current ethanol testers arent full scale, they’re hard to read, and if you get fuel on them, the graphics come off. So we set out to design a tester to meet our needs. With our new Pro Series kits weve made a lot of improvements. -The new testers are larger and easier to fill. -Kits include two testers. Use the second to test your E85 and your gasoline when mixing, keep water for future testing, or as a spare. -Kits come in a case that can be used to dispense fuel in to and fill your tester. No more looking for a cup or container to dispense fuel in to. -Improved graphics so the ethanol content can be read from the front or the magnified view from the back through the glass. -Larger testers are more stable when left to stand on their own. -Testers have measurements that are displayed in 2.5% increments. -Include 2 pipettes to make taking fuel samples easier. -Have laser engraved graphics that are guaranteed to never come off or dissolve. -Are compact at approx. 3.4" x 1.2" or 86mm x 30mm and easy to store. -Are full scale so if your fuel is E0, E10, E50, E90…no more guesstimating. -Come in a container that includes the testers, pipettes, and directions that is approx. 4.8" x 2.4" or 123mm x 64mm