Device for visually indicating a pressure or temperature condition.

摘要

Indicating device (10) suitable for visibly indicating conditions such as the application of force or pressure or the exposure to a critical temperature. The device (10) includes a porous pad (20) containing an indicating dyed chemical, a wick (24) maintained in spaced relation to the pad (20) and a snap action activating means. The activating means forces the wick (24) into contact with the pad (20) and dyed chemical migration provides visible indication of the application of force or pressure. The indicating dyed chemical may be frozen and the activating means engaged. Upon reaching a critical temperature the frozen chemical melts allowing dye migration into the wick (24) and a visible indication of exposure to the critical temperature.