The Rhino Brix refractometers are rugged and reliable with exceptional optics. The Rhino Brix30 Handheld features a sealed housing and eyepiece making the unit IP67 rated dust proof and water resistant. This rating is the highest in the industry and is unmatched by our competitors. Our Rhino Brix refractometers are shock resistant, temperature compensated, accurate and affordable. For field or factory use, they are the refractometer of choice.