A test device for assaying liquid samples for the presence of a predetermined reagent is described. The device comprises telescoping top and bottom members defining a liquid reservoir therebetween, resilient means for biasing the members in the open position, one or more test wells in the top member with bottom openings covered with microporous membranes, a co-reactant immobilized on the membrane surfaces, and sorbent means between the members spaced from the membrane(s) in the open position but...

An account is given of a test vessel, more specially for use in a photometer. The vessel has inwardly running wall parts forming hollows and at the edges of these hollows there are outwardly running hollow processes for taking up capillary tubes used in conditioning a liquid in the vessel for a measuring operation.

A method of testing a substance for carcinogenic activity which comprises contacting the substance with isolated cell membranes having masked rearrangase activity and after a predetermined interval of time testing the cell membranes for rearrangase activity. This method enables substances to be screened for possible carcinogenic activity. A test kit is also described.

A pressure test plug for use with high pressure systems to sense the pressure or temperature by means of a test probe. The test probe is connected either to a pressure gauge, thermometer or other sensing device and is received within a resilient core member in a pressure plug. The resilient core member is of a special probe passage construction which receives the test probe in a slit through the core passing through an intermediate valve pocket. The slit on the top side of the valve pocket is he...

A closed-bottom test tube has a lower inner surface coated with a reagent. A slidable portion sealingly engaging the inner wall of the test tube is inserted downwardly to maintain a quantity of liquid in continuous contact with the reagent. Pressure relief means within the piston provides for the discharge of air trapped between the piston and the liquid.

A pipe coupling device for connecting the open ends of two axially aligned fluid conduits and including a removable disc that blocks the flow of liquid through the coupling. A cylindrical sleeve surrounds and seals against the ends of the open conduits to be connected. A slot is provided in the sleeve and is positioned to permit a disc to be inserted in the coupling in a plane transverse to the fluid conduits. The disc may be removed and the slot subsequently sealed to provide uninterrupted flui...

An improved dip and read type test device having a flat bibulous matrix having an indicator incorporated therewith, the matrix being disposed between and attached to a pair of liquid impervious members and having exposed peripheral edge portions such that upon immersion into a solution containing material to which said indicator is responsive, flow of said solution into said matrix through said edge portions causes formation of measurable visible indicia pattern on the matrix.

Test strips for the detection of components in liquids, especially in body fluids, comprising a holder and at least one indicator layer containing detection reagents wherein one surface of the layer is attached to the holder and the other surface is covered with a fine meshwork.

A test indicator is disclosed wherein a rotational displacement value of a measuring element is enlarged and transmitted by a sector gear supported on a main body of the test indicator to an indicating device, and the aforesaid sector gear is urged in two rotational directions opposite to each other by two springs so that the sector gear can be held at the neutral position. The two springs for urging the sector gear are previously differentiated in resiliency from each other so as to provide two...

Test pins with sidewardly biased plungers to insure electrical contact.