Extech-RF10-H&-held-Refactometer-EXTECH-RF10-EU-The-refactometer-optically-determines-the-sugar-content-of-fruit-juices-&-other-liquids-Only-three-drops-of-the-liquid-are-needed-for-testing-The-reading-is-shown-as-a-percentage-The-simple-&-exact-focussing-makes-this-device-easy-to-use-Extech-RF10-H&-Held-Refactometer