CL04-12 RG001-RG999 Microwave High Voltage Rectifier Diode & Fuse UK Dispatch.
£3.40
(one direction is 0 ohm, and another direction is about 100k to 200k ohm ). Because the result will be 0 ohm on both direction. This can be used in a large number of Microwave Ovens, Combi Ovens, Induction Cookers, etc.