The REED R9500 is a handheld optical refractometer that reads sugar concentration on a 0-32% Brix scale from just a couple of drops of sample, using automatic temperature compensation for consistent readings in the field. It is commonly used across fruit, juice, and beverage production to check sweetness/ripeness, and ships with a hard case and calibration screwdriver. This listing includes an add-on NIST-traceable calibration certificate for documented accuracy.