Test with a multimeter

Reed switch

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Now: With no magnet

NS CircuVanta 6000 counts · auto range DCAUTO•)))HOLDFUSE− HOLD LIGHT OFFV⎓V~Ω•)))FmA⎓ mA400 mACOMVΩ Pin 1 1 Pin 2 2
Pin 1: Pin 1 (1) Pin 2: Pin 2 (2)

Red probe Not connectedBlack probe Not connected

Hold the probe and drag it to the tip of a leg. Tapping works too: first pick the probe, then the leg.

Set the range to continuity.

Measure step by step

A reed switch is normally open: when a magnet comes near the glass tube, two metal blades stick together and close the circuit. It works either way round. You take two measurements depending on the magnet's state.

The glass tube is fragile: do not bend the pin close to the body.

  1. 1Without the magnet
  2. 2With the magnet near
  3. 3Resistance with the magnet near