Extech RF20 Salinity Refractometer with ATC

These precision optical instruments should be handled gently; avoid touching the optical surface. Careful use of these instruments will provide years of reliable service. Features: - Easy to operate refractometers provide accurate and repeatable measurements on easy to read scales - Automatic Temperature Compensation - Requires only 2 or 3 drops of solution - The prism and lens with a simple focus adjustment provides repeatable results - Salinity refractometer measures the concentration of dissolved salt in water

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