Some wrenches have electric light and
audible buzzer ( Description states: w/Light & audible buzzer ) An operator
may elect to preset a torque value on the dial face of the torque wrench prior
to torquing. During the torquing of the fastener, the pointer needle of the
wrench makes contact with the pre-set brass contact needle and a red light and
buzzer sounds, indicating the pre-set torque value has been reached.