Atago 3850 PAL-RI Digital Hand-Held Pocket Refractive Index Refractometer, Refractive Index 1.3306 to 1.5284nD Handheld pocket refractometer for measurement of refractive index 1.3306 to 1.5284nD with a temperature range between 5 to 45 degrees C Continuous scrolling display of nD and temperature (1 degree C of the measurement) LED-illuminated digital display, with an external light interference (ELI) feature to alert user to outside light interference Rectangular palm-sized shape (109 x 55 x 31mm), with prism housed in circular sample well Durable, acrylonitrile butadiene styrene (ABS) resin body, with Ingress-Protection (IP)-65 rating for protection against dust and water jets