KnightsBridge 10A CAT III 600V True RMS Digital Multimeter with NCV  £45.05

The TE6 from knightsbridge is the ideal upgrade in voltage testers, offering all the features included in its predeccessor the TE2; but with much more advanced capabilities and features, like the ability to detect and measure nonsinusoidal waveforms.

The TE6 is stylish and compact to fit in your everyday toolkit, and features a backlit screen for work in all enviroments. 

The need for true-rms meters has grown as the possibility of nonsinusoidal waves in circuits has greatly increased in recent years; for example: in variable-speed motor drives, electronic ballasts, computers, Solid-state environments, and more.

This true RMS device can read both sinusoidal and nonsinusoidal ac waveforms.