This magnetic probe is designed to be used with a wide range of for instruments, including for 190 Series, for 3540 FC, for 1736 and 1738, for 434-II and 435-II, for 437 Series, and for 438-II. The MP1 Magnet Probe, also known as the Probe, is an innovative accessory that features a magnetic tip specifically designed for use with 4 mm safety test leads. The MP1 Magnet Probe is rated CAT IV 600 V and CAT III 1000 V, which guarantees its safety and suitability for a wide range of electrical applications. It can handle a maximum current of 4 A, making it suitable for both high and low current measurements. The design of the MP1 Magnet Probe enables it to fit into recessed screw holes with a diameter of at least 6 mm. The actual product may have slight color differences or differences, which does not affect use. Colour:Black Material:plastic Package Contents: 4 x Magnet Test Probe Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.