A capillary transfer pipette includes a draw tube having a distal end defining a draw tube opening through which liquid is drawn via capillary action, a proximal end, and a lumen. A squeeze bulb is arranged proximally of the draw tube and defines a fluid chamber in fluid communication with the lumen, the squeeze bulb being compressible to dispense drawn liquid from the draw tube. An air vent hole is formed in at least one of the draw tube or the squeeze bulb, and is configured to vent air to facilitate drawing of liquid through the draw tube opening via capillary action. A volume indicating element may be provided on the draw tube, and the air vent hole may be located proximally of the volume indicating element. The lumen may be formed with a first diameter at the proximal end and a differing second diameter at the distal end. Methods of collecting liquid with, and of making, a capillary transfer pipette are also disclosed.

Unitary measuring pipettes include a tubular body of biaxially oriented thermoplastic material, together with size reduction, elimination, and/or reorientation of longitudinally spaced, raised circumferential witness features, to mitigate or avoid interference between such witness features and graduated volumetric markings on an outside surface of the tubular body. Methods and apparatus for vacuum forming of unitary measuring pipettes are also provided. Gas permeable apertures or pores having a maximum width of no greater than 150 microns, in ranges of 10-100 microns, 10-50 microns, or subranges thereof, may be defined in face plates or inserts received by mold blanks, or defined in molding surface of cooperating mold bodies, and may be used to produce a tubular pipette body having reduced height witness features. Cooperating mold bodies may each be produced from multiple mold body sections with gas passages defined therein and/or therebetween.

The present invention relates to a device and a method for qualitative and quantitative analysis of heavy metals and more particularly provides a device and a method for qualitative and quantitative analysis of heavy metals utilizing a rotary disc system.

The present invention relates to a device and a method for qualitative and quantitative analysis of heavy metals and more particularly provides a device and a method for qualitative and quantitative analysis of heavy metals utilizing a rotary disc system.

The present invention relates to a device and a method for qualitative and quantitative analysis of heavy metals and more particularly provides a device and a method for qualitative and quantitative analysis of heavy metals utilizing a rotary disc system.

The present invention relates to a device and a method for qualitative and quantitative analysis of heavy metals and more particularly provides a device and a method for qualitative and quantitative analysis of heavy metals utilizing a rotary disc system.

A thin film vessel useable in gravimetric methods for measuring the total dissolved solids or total solids in a liquid sample, or the moisture content of a solid sample. The vessel includes a main body formed of a thin walled polymeric material having a melting temperature greater than 180 C. The main body comprises an open top edge and a sealed bottom edge which define an inner cavity configured to hold a volume of liquid, and indicia applied to a portion of the main body, wherein the indicia include a tare weight of the vessel.

The present invention provides microfluidic pScreen devices for quantifying the concentration of DNA fragments in a liquid sample by using magnetic-responsive silica micro-beads and nonmagnetic-responsive silica micro-beads. The devices of the present invention allow for rapid, simple and inexpensive quantification of DNA fragment concentration in a sample. The devices do not require complex instrumentation and can be performed in less than three minutes. Moreover, they are compatible with complex samples including, without limitation, unpurified PCR amplification products, and thus can be expected to seamlessly integrate into various common molecular biology techniques and workflows.

A multi-functional specimen collector comprises a barrel, a shaft body disposed in the barrel, a piston disposed in the barrel and connected to the shaft body, a first seal cap connected to an end of the barrel, and a second seal cap for connecting to the piston after the shaft body is removed. An interior at the end of the barrel is disposed a stopper for restricting a moving range of the piston inside the barrel to prevent the piston from being pulled out of the barrel. The outer diameter of the stopper and the inner diameter of the barrel are designed to closely fit each other. The inner diameter of the stopper might be smaller than the outer diameter of the piston, and the inner diameter of the stopper might be larger than the largest outer diameter of the shaft body.