01483 302 700



Newtons4th Ltd (abbreviated to N4L) was established in 1997 to design, manufacture and support innovative electronic equipment to a world-wide market. Specialising in sophisticated test equipment, particularly related to phase measurement, the product portfolio includes Power Analyzers, Frequency Response Analyzers (gain/phase analyzers), Impedance Analyzers, Vector Voltmeters, Phase Meters, true RMS voltmeters, Selective Level Meters and Laboratory Power Amplifiers.

The company was founded on the principle of using latest technology and sophisticated analysis techniques in order to provide the customers with accurate, easy to use instruments at a lower price than has been traditionally associated with these types of measurements.

Newtons4th Ltd are ISO9001 registered, the internationally recognised standard for the quality management of businesses. In recognition of the technical innovation and commercial success of the PPA series, N4L received the “Innovation 2010″ Queen’s award for enterprise.

Power Analysers

Frequency Response Analysers

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Caltest Instruments Ltd

4 Riverside Business Centre

Walnut Tree Close


Surrey GU1 4UG

United Kingdom

Tel: +44 (0) 1483 302 700

Fax: +44 (0) 1483 300 562

Email: sales@caltest.co.uk

Caltest have been providing power sources and test instrumentation solutions for over 17 years and are proud to represent a number of industry leading manufacturers.