High quality refractometer for fruit, food, beverage, ketchup, tomato and other applications making use of the popular Brix scale. Made in UK. IP65 rated against moisture ingress. Zero offset screw provides calibration against known standard (typically water) or acts as a manual temperature compensation (MTC) negating the effects of temperature prior to taking a reading (MTC). Locking ring prevents accidental adjustment. Large barrel with thick rubber shield for easy handling in cold weather and providing insulation against temperature during use. Adjustable eyepiece for easy focussing. Clip on replacement illuminator flap with ‘dribble feature' for bubble free sample application.