Abstract: Non-invasive, portable, modular testing apparatus for non-invasively testing timepieces for fluid integrity without damaging or dismantling the timepiece and without interrupting the timekeeping function or operation thereof, including a transparent tubular container member capable of providing a high pressure, fluid sealed environment for the timepiece, the container member being open at one end and provided with an enlarged, integral rim portion, the opposite integral end of the tubular container member including an enlarged integral rim portion equal in diameter to the rim portion of the open end providing a rigid, non rockable base for the container, a circular, rigid, transparent closure member for the container securing the closure member to the tubular container member, and a pressure applicator integral with the tubular container member, for automatically pressurizing the internal volume of the tubular container member.