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Providing professional optical solutions since 1995.
Handheld Refractometer
What is a handheld refractometer? Handheld Refractometers are portable solution analysis tools that operate on the principle of optical refraction. By measuring the angle of light refraction, they quickly determine the concentration of a solution. With user-friendly operation and precise results, they are widely used in industries such as food and beverage, agriculture, and laboratory testing.   How are our refractometers different? The RH series handheld refractometers have been a staple product of our company since 1995. Upholding the principle of "Quality-Oriented" and "Relentless Refinement", we never compromise on materials by using low-cost aluminum or plastic components. Instead, we use solid copper for key parts like the prism base and eyepiece. This not only lends the instrument a refined, robust feel but also effectively eliminates measurement errors caused by oxidation, corrosion, or deformation, thus enhancing accuracy and durability.   In terms of optical design, we use crown glass as the prism substrate. Thie material is known for its low dispersion characteristics, which effectively reduce refractive deviation across different wavelengths. Additionally, each model features a precisely engineered internal optical path, meticulously calculated and independently designed by our engineers, to maximize measurement accuracy.   Sub-Categories Brix Refractometer Agricultural Food Processing Industrial Applications Chemical Research Salinity Refractometer Aquaculture Fish Farming Food Processing Chemical Research Antifreeze/Coolant Refractometer Automative Repairing Battery Servicing Car Maintenance Wine/Alcohol Refractometer Wine Making Beer Brewing Agriculture Specific Applications Honey, soymilk, medical applications and more   Full Products List  
Inline Refractometer
Inline Refractometers An inline refractometer is a sensor installed directly in pipelines or tanks to continuously measure the concentration or refractive index of liquids in real time. By detecting how light bends through a solution, it provides instant readings without manual sampling. This allows for automatic process control, improves product consistency, reduces waste, and lowers labor costs—making it a valuable tool in industries such as food, chemicals, pharmaceuticals, and battery production.     Our Inline Refractometer Models We offer a range of high-precision inline refractometers designed for industrial and laboratory use. Each model features automatic temperature compensation (ATC), a sapphire prism for durability, and both 4–20mA and RS-485 outputs for easy integration with control systems.    - Sugar & Brix Refractometers Measure sugar concentration (0–93% Brix) in juices, syrups, and honey for food and beverage production.    - Ethylene Glycol / Antifreeze Models Used in automotive and chemical applications to monitor glycol concentration in real time (0–90%).    - NMP Solvent Refractometers Designed for lithium battery production, these models ensure accurate concentration control during distillation and recycling.    - General Industrial Models For monitoring coolants, cutting fluids, or chemical mixtures in process lines, supporting stable and efficient production.     Full Products List
Industrial Endoscope
What is it? An Industrial Endoscope (or videoscope, borescope) is an optical inspection tool that allows users to visually examine areas that are otherwise inaccessible, such as the interior of engines, pipelines, or machinery. It uses a small camera probe—often with LED lighting—to transmit real-time images to a screen. Borescopes are essential for non-destructive inspection, helping detect defects, wear, or foreign objects without disassembling equipment. This improves maintenance efficiency, reduces downtime, and supports quality assurance across many industries.     Our Borescope Models We offer a variety of industrial-grade borescopes designed for precision inspection in demanding environments. Our models are equipped with articulating probes, high-resolution displays, and photo/video recording, making them ideal for professionals in maintenance, repair, and quality control.    - Two-Way Articulating Borescopes With dual-direction bending, these models allow flexible inspection in confined spaces—perfect for automotive, construction, and HVAC applications.    - Four-Way Articulating Borescopes Provide full directional control (up/down/left/right) for comprehensive internal viewing, commonly used in aerospace and power plant maintenance.
Gemstone Tester
Gemstone Testers Gemstone testers are essential tools used to evaluate the identity, authenticity, and properties of gemstones through various optical and physical testing methods. Different types of testers serve specific purposes—such as measuring refractive index, analyzing optical behavior, or examining internal features under magnification. These instruments enable professionals to distinguish between natural, synthetic, and treated gemstones, supporting accurate appraisal, quality control, education, and fraud prevention in the gem and jewelry industry.     Our Gemstone Testing Instruments We offer a complete range of gemstone testers designed for appraisers, gemologists, traders, and laboratories. Each model is built for accurate, efficient, and field-ready use, supporting both professional and educational environments.   - Gem Refractometers Measure refractive index (e.g., 1.30–1.81) to identify gem types and detect treatments or imitations. Ideal for verifying authenticity in daily appraisal work.    - Gem Polariscopes Distinguish between isotropic and anisotropic stones, detect optical character and axiality—essential for identifying natural vs. synthetic gems.    - Gem Microscopes Magnify surface and internal features to observe inclusions, treatments, or synthetic growth patterns with 10X–80X magnification and darkfield illumination.    - Additional Accessories We also offer stone holders, filters, and illumination tools to enhance testing accuracy and workflow efficiency.       Full Products List

Experts in Refractometry
Fuzhou Lindian Technology is a professional manufacturer and distributor of handheld and digital refractometers based in China. Founded in 1995, we have over 30 years of experience in the field of optical instruments. We take pride in delivering only the highest-quality optical instruments. Our products have earned the trust of customers in more than 100 countries worldwide.
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Interesting Articles Updated
July 11, 2025
Industry news on handheld refractometers
    Recently, the market for handheld refractometers has shown a thriving development trend. According to market research reports, the global market size of Brix refractometers (including handheld refractometers) will reach a certain level in 2023, with the Chinese market occupying an important share. It is expected that by 2029, the global market size will continue to grow at a considerable compound annual growth rate (2025-2030 refractometer industry market supply and demand analysis and investment evaluation planning analysis report).       From the perspective of segmented markets, handheld refractometers have been continuously applied in many fields such as food processing, gemology, school teaching, and drug testing due to their portability and ease of operation. In the food processing industry, it is used to monitor the sugar content of products such as fruit juice and syrup; In gemology, assist in identifying the type and quality of gemstones; In school teaching, it has become a commonly used equipment for basic optical experiments; During drug testing, it can assist in analyzing the concentration of drug solutions. This widespread application has driven a steady increase in market demand.     At the technical level, the handheld refractometer industry continues to make breakthroughs. Traditional handheld refractometers are gradually upgrading towards digitization and intelligence. The market share of digital handheld refractometers is gradually increasing. Compared with traditional styles, they have higher measurement accuracy and more convenient data reading and recording functions. Some new digital handheld refractometers use advanced optical sensors, with measurement accuracy up to two decimal places or even higher, greatly meeting the needs of industries with high-precision measurement. Some companies have also developed handheld refractometers with automatic temperature compensation function, which can eliminate the influence of temperature on measurement results and make measurement data more accurate and reliable. For example, Hebei Jingte Instrument Co., Ltd. has published a utility model patent for a handheld refractometer. The device is not only convenient to use and can avoid the leakage of the liquid to be measured, but also comes with a light source that is not affected by the intensity of light. It can also adjust the distance of the eyepiece, providing users with a better user experience.    The global handheld refractometer market is fiercely competitive, with numerous companies vying for it. Internationally renowned companies such as AKR ü SS Optronic, Anton paar, Atago, etc., have taken a leading position in the industry with advanced technology and extensive market layout. Domestic enterprises are also constantly striving to catch up, gradually increasing their market share through technological innovation and product optimization. In the process of competition, differentiated competition among enterprises has become increasingly evident. In addition to product performance and price competition, service quality, brand influence, and other aspects have also become the focus of competition. Top enterprises continue to increase their R&D investment, launch innovative products, lead the industry development trend, and also expand their market territory through mergers and acquisitions, cooperation, and other means to enhance their competitiveness.
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July 11, 2025
Summary of the 2025 China (Beijing) International Optical Instrument Exhibition
    The 2025 China (Beijing) International Optical Instrument Exhibition will be held grandly at the Beijing National Convention Center from June 30th to July 2nd. Under the direct participation and organization of numerous domestic and foreign industry associations as well as government regulatory departments, this exhibition continues to exert strong influence in the field of optical instruments with its style of "clear theme, prominent features, emphasis on effectiveness, and continuous innovation". It has become the most authoritative, professional, and largest industry event in Asia, winning high praise from numerous exhibitors and visitors.    Scope of exhibits and technical highlights: Optical components and materials: This exhibition area gathers a rich and diverse range of exhibits. In terms of optical glass, various glass materials with special optical properties, such as low dispersion glass, high refractive index glass, etc., have been demonstrated, which can be widely used in high-end optical lens manufacturing. Sapphire materials, quartz materials, and plastic lenses have also attracted a lot of attention, and lenses made of different materials have demonstrated extremely high levels of dimensional accuracy, optical uniformity, and other aspects. At the same time, related products such as grinding materials and coating materials are also readily available, providing a complete material solution for the production and processing of optical components. Various optical components such as filters, spectrometers, spherical and non spherical lenses, prisms, cylindrical mirrors, reflectors, flat windows, focusing mirrors, half mirrors, and beam expanders are dazzling. Some companies showcase non spherical lenses with surface precision reaching the nanometer level, representing the top manufacturing level in the current industry. Optical processing equipment: Various cold processing and non spherical processing equipment showcase the advanced technology of current optical processing. Single sided and double-sided grinding and polishing machines can achieve high-precision processing of lens surfaces through intelligent control systems, ensuring that the flatness, roughness, and other indicators of the lenses meet strict requirements. The emergence of molding equipment for spherical and non spherical lenses and electroplating equipment has improved the production efficiency of optical components and reduced production costs. Diamond turning equipment, with its high-precision machining capability, can perform precise turning on various optical materials and produce complex optical surfaces. Glass cutting machines, cutting machines, external circular saws and other equipment play an important role in the cutting and processing of optical materials, and their cutting accuracy and efficiency have been significantly improved. The crystal growth equipment showcases the preparation process from basic materials to optical crystals. Some companies have demonstrated new crystal growth technologies that can grow larger and higher quality optical crystals, providing high-quality raw materials for the manufacturing of optical components.    This exhibition comprehensively showcased the latest development achievements and trends in the optical instrument industry, providing a platform for communication and cooperation between upstream and downstream enterprises in the industry, and promoting the coordinated development of the industry chain. At the same time, the exploration of industry development issues and the consensus reached during the exhibition will help guide industry enterprises to better respond to challenges, seize opportunities, and promote the development of the optical instrument industry towards higher levels and more innovative directions in the future. It will make positive contributions to the overall upgrading of China's optical industry and the enhancement of its international competitiveness.
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