Croydon Precision Instrument Company (Cropico) started with a small assortment of standard resistors, resistor banks, and a voltage ratio bank, in 1952. In the 60s, Cropico expanded its product portfolio, with new products such as the RH9A-4 high resistance decade bank. This was the immediate start of Cropico products’ worldwide export. Steady growth continued throughout the 70s, 80s, and 90s of the twentieth century. Cropico stuck with Croydon during this time, while simultaneously extending their activities through the set-up of engineering design and product development services in Norwich.

One of the developments was an entirely new production platform: accurate measurement of low resistance. The DO4, DO4000, and DO5000 milli ohm and micro ohmmeters series were introduced. In 2006, Cropico was acquired by the Seaward Group, as Seaward was looking for ways to expand its test and measurement industry expertise. Seaward’s continued support for new product development will ensure that the Cropico brand is strengthened, while retaining the leading position as a high-performance technology supplier for industries ranging from automotive and aerospace, to defense and utilities companies.

The current product portfolio includes:
– Resistance Standards & Decades
– Milliohmmeters & Microhmmeter
– Temperature Measurement

For a complete list of the Cropico products, visit


Latefa El Amrani

Latefa El Amrani


As an independent calibration laboratory of electrical/electronic temperature and geometric measuring equipment, we and our customers benefit from accurate measurement results and good traceability. This requires good and stable measurement and control equipment. To achieve this, a reliable partner is needed that offers high quality and thinks along with us, and TTMS is such a partner. We have been working in good collaboration with TTMS for many years. Technical problems are challenges for them and questions are answered quickly and adequately. TTMS is pro-active: they always think along with us. They are also customer-oriented, flexible, committed and reliable. They always live up their appointments. Also, they are experts, provide good advice and deliver the right equipment. In short, MetricControl likes to work with TTMS.

Hypex Electronics

Joop van Bijnen

Hypex Electronics

I have been doing business with TTMS for years. They offer us good advice, and have a wide range of products to choose from. Before we decide to purchase a product, TTMS allows us to use a demonstration model to experience for a few days whether the product meets our expectations. They think along with us and don't try to sell me just anything. Should it occur, for whatever reason, that there is a defect in the equipment of TTMS, they will follow up with the required service with regard to repair and, if necessary, a replacement. With its service, TTMS invests in a good and lasting customer relationship.


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