JAVALYTICS; Easy Roast Color Measurement for Better Coffee. JAVALYTICS Easy Roast Measurement for Better Coffee. We simplify the measurement of dgree of roast. Just touch the easy to read screen for instant results. the JAV RDA U views samples through an optically flat glass dish while the JAV RDA D samples directly in a sample tray, avoiding the use of glass. You can choose to run from the built in touch screen, Computer Systems, Construction Glass ...