Clarke-Hess was founded as an electronics test and measurement company in 1969. Specializing in DC / low frequency applications, Clarke-Hess develops instrumentation for defense, commercial and industrial companies, and laboratories that meet national standards. Through its dedication to precision instrumentation, Clarke-Hess gained a reputation of representing quality, service, and extraordinary performance.

Clarke-Hess offers the following products:
– Power analyzers
– The Digital Phase Angle Standard
– Phase meters, phase angle voltmeters (PAV), and gain / phase analyzers
– Precision AC current source
Voltage and current sources and / or calibrators
Transconductance amplifiers

For a complete list of the Clarke-Hess products, visit their website


Giel van den Broeck

Giel van den Broeck


"TT&MS has always been ready to provide us with state-of-the-art testing and measuring equipment. Characteristic is that TT&MS offers an extremely good service, as well as extensive support in the specification and selection of the equipment. The employees are technically well versed, a valuable distinguishing factor compared to other players in the market. Moreover, this technical knowledge is accompanied by a constructive, solution-oriented and personal approach."

Signify Netherlands

Hans Misdom

Signify Netherlands

“I’ve known the people at TTMS for years. An open and honest relationship has developed in which we can say everything to each other, resulting in a short but powerful communication. This increases efficiency, both for me and for TTMS. Ever since I developed monitors at Philips, we have been using their video protocol test equipment for our latest protocols. By listening carefully, TTMS and their manufacturers respond to our needs. The mutual benefit is that we get good support and they make better testers. In my current developments and tests on Signify connected LED lighting systems, we use various power supplies, electronic loads and analyzers. If TTMS has something new that is of interest to me, they know that I am positively critical of it. I’m looking for reliable equipment that is easy to use and TTMS continues to keep an eye out for new possibilities. For many years now, we have had a pleasant cooperation that works both ways. They know the market well and know how to find the right manufacturers for the right equipment.”


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