The Atago 3820 PAL-2 handheld, digital refractometer fits in many pockets, measures Brix in the 45.0 to 93.0% range and temperature 9.0 to 99.9 degrees C, automatic temperature compensation (ATC), an external light interference (ELI) warning, and Ingress Protection (IP)-65 rating for dust and water. A Brix refractometer measures the refractive index of a solution in a sample, converts it to sugar concentration in units of percent by weight (% Brix, also known as degrees Brix), and displays the results. Handheld refractometers, also known as sugar meters, concentration meters, or Brix meters, are commonly used in the culinary, food and beverage, pharmaceutical, educational, geological, chemical, and ecological industries, and for water-testing applications. Please read description, look at photos and ask questions before purchasing and leaving feedback. I also try to ship same day or next day, after I ship I have no control over the carrier and how they operate. Atago pal-2 Pocket refractometer.