In 2006, Ohm-Labs started as a Process Instruments offshoot, focusing exclusively on resistance products. Part of their expertise comes from the famous company Leeds & Northrup. Process Instruments acquired resistance wire, fittings, and related resistance production test equipment in 1994.

Ohm-Labs acquired manufacturing tools and the rights of Electrical Instrument Service / Sensitive Research after the owners retired in 2010.

Through continuous improvement and consultation with top researchers from the world’s national testing institutes, Ohm-Labs builds on the best features of the L&N, JRL, and EIS products by implementing and refining improvements, thus delivering pioneering resistance products.

Ohm-Labs produces:

– Standard resistors
– Precision current shunts
– High voltage dividers

Ohm-Labs’ quality is accredited by the American Association of Laboratory Accreditation (A2LA) to IEC / ISO17025, including ISO9000:2000 and ANSI/NCSLI Z540.1 standards.

All Ohm-Labs products are made in the USA and include accredited calibration.
“Excellence in Resistance” is their goal.

For a complete list of Ohm-Labs products, visit their website



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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