Safebreak R2 Socket Adaptor compatible with any meter with industry standard 4mm plugs and most standard test lead probes. Speed up 17th edition, part P and periodic testing of electrical installations with this plug-in adaptor. It enables safe and fast testing at socket outlets without the need to remove the socket faceplate from the wall. This saves time when taking R2 and R1+R2 measurements as well as voltage measurements.