Digital Displays  Manufacturers, Traders, Suppliers

After more than 30 years' rapid growth since the foundation in 1990, CASTECH INC. has become a recognized leading supplier of crystals, optics and laser components in the world. In 2008 CASTECH successfully completed IPO in Shenzhen stock exchange. (Stock Code 002222) Today, at our 450,000 sq ft advanced facility, over 1000 employees are dedicating to satisfy customer needs in terms of performance and cost effectiveness.
Crystals for Laser and Telecom Application:
With more than thirty years' untiring effort, CASTECH has developed flux, Czochralski, water solution and Bridgman-Stockbarger crystal growing technology, now is a worldwide leading supplier with largest mass production lines in the world for LBO, BBO, Nd:YVO4 and KTP. In addition, we also provide CLBO, BiBO, KDP, KD*P, Yb:CALGO, Yb:KGW, Ti: Sapphire, TGG, TSAG, α-BBO and other crystals for laser and telecom industries.

Zhejiang Crystal Optoelectronic Technology Co., Ltd. (COT) was founded on August 2, 2002 and listed on the Shenzhen Stock Exchange on September 19, 2008 (stock code 002273). In 2022, total revenue reached 43.76 billion yuan, with year-on-year growth of 14.86%, and the net profit climbed up to 5.95 billion yuan.
Over the past twenty years, COT has been a global optical expert in the field of information transaction, providing one-stop professional services from core components up to modules and solutions. At present, the company is involved in R&D and manufacturing process in five major industrial sectors, and its products include Optic Components, Thin-film Optics, Semiconductor Optics, Automotive Electronics & AR+, Reflective Materials, etc. The company has more than ten wholly-owned and controlling subsidiaries, and participates in multiple enterprises such as Japan Guangchi Co., Ltd., Ningbo Jishi Investment, Wuhan Wuyi Yuntong, Jingbang Optics, and Zhaoge Digital.
Our products span from Consumer Electronics, to Automotive Electronics and Metaverse. For Consumer Electronics, products such as Infra-Red Cut Filter (IRCF), Camera Cover Glass (CG), Narrow Band Pass Filter (NBPF) help COT to rank among the world's top producers and sellers. Our core competitiveness lies in its leading global technology integration ability to combine "Thin Film Design, Micro Nano Optic Techonology, Optic Cold Forming, and large-scale Automation" together. For Automotive Electronics, Head Up Display (HUD), Car Cams, and LiDAR window glasses have all been applied to the products and services of globally renowned vehicle manufacturers. For Metaverse, AI and display technology have developed rapidly in past few years, and COT has laid out a full technology path in the AR field to help incubate technology giants in mass production. In addition, the reflective materials produced by Zhejiang Yeshili, a wholly-owned subsidiary of Crystal Optech, have maintained a leading technological position in China for many years.
Looking into the future, with diversified application of Optics across different fields, the global optical industry has ushered in a golden opportunity. Crystal Optech will adhere to the guiding principle of "globalization, technology-oriented, and open cooperation", uphold the business philosophy of "be noble in life, be excellent in work", shoulder the mission of "innovation makes optics stronger, optics makes the world a better", and strive to "become an outstanding one-stop optical expert in the world"!

Rudolf Kiesewetter, who gave his name to the Excelsior factory Rudolf Kiesewetter in Leipzig, founded the first measuring instrument factory in Germany in 1908. In 1942, the factory was destroyed, but rebuilt after the end of the war with great and tireless efforts.
Mr. Kiesewetter died in 1958. In the same year, the company became a semi-state-owned enterprise. In the former GDR, Kiesewetter developed into the sole manufacturer for a range of measurement technology products. The main products included switch panel meters and exposure meters. Another focus was on devices for monitoring, converting and recording electrical and physical quantities.
With the reunification of Germany, Rudolf Kiesewetter Messtechnik GmbH was reborn
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Hard work, perseverance, iron will and constant foresight combined with vision resulted in products of the highest quality.
Rudolf Kiesewetter Messtechnik GmbH as well as its products enjoy high national and international recognition
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Our declared goal is to offer you, the customer, innovative products, while constantly striving to expand the product range and offer the latest technology.

About Us

AFRISO, founded in 1869 by Adelbert Fritz in Schmiedefeld/Thuringia, is an innovative, medium-sized family-owned company with more than 1,000 employees worldwide - over 550 of them at our four German sites. Traditionally, we produce measuring and control devices for temperature and pressure. For more than 50 years, we have also been manufacturing measuring, control and monitoring devices for environmental protection.
Today, AFRISO is one of the competence leaders in the field of safety around heating and tank systems as well as an industrial partner in the field of pressure, temperature and level measurement technology. Trend topics such as "Smart Home" also have a tradition with us: we have been dealing with the topic of "event reporting in buildings" since 1997. The latest Smart Home generation has been sustainably developed further since 2012 and offers convincing sensors and actuators for building security, increasing living comfort or for a better indoor climate in your home.

hopf Elektronik GmbH is one of the oldest manufacturer of radio controlled clocks being synchronized by the DCF77 transmitter and one of the leading companies in Europe. The company was founded in 1972 and produces both conventional and satellite radio controlled clocks for industrial purposes. Our products have gained an outstanding reputation in many countries.
The company hopf is specialized in hard- and software alteration in order to realize specific customer’s requirements referring to special ranges of application. Our team of experienced experts and technicians advises you at any time. It is our philosophy to reach our customer’s confidence by efficiency and flexibility. Our production line is not only characterized by high quality standards but includes also services such as new developments, technical advices and training courses which are offered in the English language, too.
Our products are developed by our own engineers and are manufactured by using the newest technical equipment. Furthermore, the merchandise is tested for its functionality based on the required quality standards.
We want to have satisfied customers. That is the reason why the high quality of our products and our services is one of our uppermost company objectives.
Due to the high precision and reliability of the hopf radio controlled clocks our customers belong to the sectors of space technology, aviation, navigation, modern communication technology and energy supply. The industrial sector refers is covered by technology of measurement and registering of business operating data.