A sterility indicator of the type used in hospitals and laboratories. The device uses a cylindrical ampule holder with an ampule containing nutrient media and spore strip disposed therein. One or more gas pervious, liquid impervious tortuous paths lie between the interior and exterior of the ampule holder. Fracturing of the ampule is by the combination of a rotation and rotation prevention means with respect to the cylindrical axis.

A harness indicator is highly reactive to a trace amount of Ca.sup.2+, and is slow to degrade in a high temperature environment of greater than 50.degree. C. In one embodiment, the hardness indicator contains EBT, a pH buffer, and a masking agent as main components, and an admixture of Mg-EDTA. In another embodiment, the hardness indicator contains EBT, a pH buffer, and a masking agent as main components, and an admixture of anhydrous Mg-EDTA. In another embodiment, the hardness indicator contai...

An indicator device includes a support member formed by two coupled flat panels made of metal or synthetic material, a plurality of holes formed in the exposed panel according to the pattern of Braille writing according to the characters to be represented; the holes are engaged by pins made of synthetic material which is resistant to abrasion and to rubbing-induced wear, so that their dome-shaped rounded ends protrude from the exposed panel.

The movement has a rectangular section case for accommodating a magnet rotor so as to turnably support the magnet rotor engaged with a pointer spindle. A pair of inner core bobbins wound by an electrical wire each are slidingly engaged with the case through the rectangular opening so as to be opposed to each other. A pair of outer bobbins wound by an electrical wire each are slidingly engaged with the pair of inner core bobbins through a rectangular opening of each outer bobbin so as to be oppos...

A calendar indicator includes a date disc, a week disc and an indicator member. The date disc is equally divided into 28 date indicating segments. The date disc further has 28 numerals, from "1" to "28", respectively provided in sequence on the 28 date indicating segments of the 28 date sectors. The three adjacent date indicating segments having the numerals "1", "2" and "3" provided thereon respectively form a first, a second and a third sub-segment. Three numerals including "29", "30" and "31"...

A temperature indicator for indicating the temperature condition of an object while subjecting the object to an external temperature environment. The temperature indicator includes a substantially transparent outer shell containing a substantially transport modeling structure, which includes a plurality of heat receiving elements, for modeling the thermal diffusivity of the object. The indicator also includes a temperature measuring device in thermal contact with the modeling structure for measu...

A magazine with an elongated indicator member attached to the follower and projecting outside the body of the magazine so that the length of the indicator member indicates how many bullets remain in the aperture. The indicator member is provided with a series of knots at predetermined intervals so that the number of knots on the portion of the indicator member projecting outside the body of the magazine equals the number of bullets remaining in the magazine. More elaborately, each knot can corre...

An apparatus for counting the number of times a container has been opened or some other event has occurred, with particular usefulness in medicine bottles and the like. An outer cover portion with a set of teeth holds an indicator wheel with an engaging pawl and another set of teeth and a ratchet wheel with a another pawl. The pawls and teeth in combination with a slot for engaging the ratchet wheel result in a lost motion drive in which the outer cover will turn relative to the indicator wheel ...

An essentially frictionless, reliable pressure indicator capable of withstanding high pressures is disclosed. The invention includes dual opposed springs, a pair of magnetic elements, and a resilient diaphragm abutting one of the magnetic elements. Use of the resilient diaphragm permits precise control of the amount of travel necessary for the magnetic attractive forces to counteract the mechanical spring forces, increasing the accuracy of the overall device. The present structure, with its resi...

There is described an improved device for indicating the status of a room or adjoining space, the device including first and second plates hingedly connected to one another along adjacent edges thereof, a spring urging the second plate into a normally closed position overlying and parallel to the first plate to the surface of a door. A magnet or equivalent devices are used to temporarily connect the second plate to a second surface, such as a door frame, adjacent to and extending at an angle to ...