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


Hans Verhees

Hans Verhees

Victron Energy

We don’t buy measuring instruments, we purchase solutions for specific measurement problems. I like to buy from TTMS, given their knowledge of test solutions in power electronics. I hate sellers. TTMS helps us to make the right choice. They even come up with instrumentation from manufacturers they do not represent themselves. And always with the perfect service: they are not complicated and just arrange what is needed.

Shell Technology Centre Amsterdam

Jan Serné

Shell Technology Centre Amsterdam

In my role within the calibration and quality lab, it is a continuous striving for quality for me. In order to ensure this, the right support from, amongst others, suppliers is essential. TTMS understands this like no other, and I have been doing business with them for years. If I need to describe the business relationship with TTMS, it would be that it’s both constructive and instinctive. The measurement instrumentation is reliable. In addition to this, TTMS’ expertise of test and measuring equipment complements the STCA.


© Copyright 2020 - TTMS B.V. | Privacy Policy | General terms of condition