Laboratory Refractometers are analog tools that are used to determine refractive index of confectionery items, beverages like fruit juice and cold drinks. These hand held or table mounted laboratory instruments adopt critical angle technology that involves application of prism and lenses to generate shadow inside glass reticule. Created shadow can be observed in its enlarged form via magnifying eyepiece. Laboratory Refractometers can be availed with standard accessories like contact liquid, test piece and thermometer. Optional accessory like thermostatic or digital circulatory water bath is also offered with these lab apparatus. High accuracy level, user friendly design, versatile nature, immediate result and low operating cost are the key characteristics of this range of instruments. We suggest recalibrating these apparatus by using de ionized water.