Overview: The document provides comprehensive technical information on various models of hand-held refractometers, including digital "Pocket" refractometers and the MASTER series. These instruments are essential for measuring the refractive index and Brix values, which are crucial in industries such as food and beverage, pharmaceuticals, and chemicals. Additionally, the document covers refractometers used for measuring the concentration and freezing temperature of solutions like battery fluids, antifreeze mixtures, and saltwater.

Specifications: The refractometers are categorized into different models with specific scale ranges and applications. The PAL series, for example, includes models like PAL-1, PAL-2, and PAL-3, with Brix measurement ranges from 0.0% to 93.0%. The MASTER series features models like MASTER-α and MASTER-T, which offer Automatic Temperature Compensation (A.T.C.) and water resistance (IP65). Other models include Battery Coolant Checkers (BC-2E and BC-3E), Salinity Refractometers (S-10E and S-28E), and Coolant Refractometer (BR-1E).

Features: Key features of these refractometers include calibration with water only, extreme water resistance (IP65), lightweight and compact design, Automatic Temperature Compensation (A.T.C.), quick measurement in 3 seconds, and ergonomic design for one-handed operation.

Applications: These refractometers are suitable for a wide range of applications, such as measuring sugar content in beverages and food products, determining the concentration of various chemicals and solutions, testing salinity and sea water concentration, analyzing alcohol content in beverages, and assessing the water content in honey. They are also used in industries like automotive, solar power, food, and chemical industries for measuring concentrations of solutions like antifreeze, saltwater, and sugar solutions.

Models and Scales: The document lists numerous models with specific scales for different substances, including Brix scales for sugar content, specific gravity scales for sea water, acid concentration scales for citric, acetic, and phosphoric acids, and alcohol concentration scales for ethyl and methyl alcohol.

Design and Patents: The refractometers feature a streamlined design with a strong grip and are protected by various patents in countries like China, Taiwan, and pending in the USA and Germany.

Principles of Operation: Refractometers operate on the principle of light refraction, where the refractive index increases with the density of a substance. The detection system measures the angle of refraction at the boundary between the prism and the sample.

Key Considerations: The Brix scale is used to measure the total concentration of soluble solids in a sample, which may require conversion charts for non-sugar substances.

Conclusion: These hand-held refractometers are versatile tools designed for precision and ease of use in various industrial applications, offering features like A.T.C. and water resistance to enhance their functionality and durability.