From inside (document excerpt):
SPX Corporation 655 Eisenhower Drive Owatonna, MN 55060-0995 U.S.A. Tech Serv.: 1-800-822-5561 Fax: 1-800-822-7805 Customer Serv.: 1-800-533-6127 Fax: 1-800-283-8665 Website: www.robinair.com Operating Instruction Sheet 75240 Hand Refractometer WARNING! To prevent equipment failure or damage resulting in personal injury: Read and follow all warnings in this instruction sheet before operating this unit.
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If the operator cannot read English, operating instructions and safety precautions must be read and discussed in the operator’s native language. – Si el operador no puede leer el inglés, las instrucciones de operación y las precauciones de seguridad deberán leerse y comentarse en el idioma nativo del operador. – Si l’utilisateur ne peut lire l’anglais, les instructions et les consignes de sécurité doivent lui être expliquées dans sa langue maternelle. · Always wear eye protection and protective clothing when working with refrigerants and sulphuric acid. Contact with refrigerants and sulphuric acid may cause personal injury. · Do not drink antifreeze (propylene or ethylene glycol base) or solution (sulphuric acid base). If swallowed, give two glasses of water and induce vomiting. Call a physician. Prism Cover plate Correction screw Mirror tube (holds the reticle scale) Eyepiece (focusing ring of diopter) Accessories Eyeshade Glass rod Screw driver Soft cloth Leather cover Application The 75240 Hand Refractometer is a portable, precision optical instrument used for measuring the freeze point of engine coolant and the operation state of battery charging liquid. It is used on transportation vehicles, such as cars, tractors, tanks, ships, etc., which use propylene or ethylene glycol for coolant and sulphuric acid for charging liquid. When a liquid (such as coolant or charging liquid) is placed on the prism, the light passing through it is bent. The more concentrated the liquid, the more the light will bend. The refractometer contains a reticle, or scale, that is enlarged through the eyepiece to measure this bent light. The values of the scale have been established to evaluate the coolant or charging liquid. SPECIFICATIONS Style: Model: Range: Resolution: Size: Weight: Battery/Coolants 75240 60°F 32°F / 1.15 1.30 sg 10° F; 0.01 sg 27 x 40 x 160 mm 176 g The reticle without any liquid on the prism. 518712 Rev. A – (1/22/03) The reticle with liquid on the prism. The reading is taken at the point the shadow line crosses the scale. Operating Instructions Use the following instructions to operate the 75240 Hand Refractometer. IMPORTANT: Read and understand all Operating Instructions and Helpful Hints before operating the Refractometer. The Hand Refractometer should now have a null point, and you are ready to begin measuring. 3. Open the cover plate, and wipe the water off the surfaces of the prism and cover plate with the soft cloth that is provided.