The invention relates to a directable magnetic mount for a light emitter. The protective mechanism includes an elongate member that can be permanently attached to the probe card cover, or attached by screws to the probe card cover. The converting electronics may also include an LED current monitoring circuit for preventing thermal runaway of the LEDs and for reliably operating the LEDs near their maximum rating so to provide the maximum amount of brightness from the LED array and maximum battery life. A sidewall of the protruded elements or a sidewall of the recess elements is slanted. Different electronic devices can, for example, be provisioned differently depending on different degrees or levels of authentication, or depending on manufacturer or product basis.