Scale-marked pipet tip for precision dispensing of fluids over a large range of volumes

In a pipet tip having

• a generally conically-shaped housing with a central axis,
• the housing defining a generally conically-shaped interior reservoir,
• the housing being constructed of a material sufficiently transparent so that any liquid contents of the housing's interior reservoir may be visually observed,
• a distal, tip, end of the conical housing having means defining a generally central aperture through which liquid contents of the interior reservoir may be discharged,
• the other, proximal, end of the conical housing having means defining a generally central bore into which the end of a pipettor may be slid, and subsequently frictionally engaged, the improvement comprising:
• a visual scale on the housing, the scale having a plurality of scale markings within each of at least two, a fine and a coarse, regions,
• a lineal separation of the housing's visual scale markings one to the next within each of the two regions being in a ratio less than 125%,
• a lineal separation between any two of the housing's visual scale markings within a single region being in a ratio of less than 220%,
• a lineal separation between any two successive scale markings of a one region and any two successive scale markings of the other region being in a ratio of less than 500%,
• wherein the visual scale is, in both regions of the scale, if not precisely linear at least roughly linear, with successive scale markings within each region that are at least in a rough linear succession;
• the interior reservoir to the housing having, from the housing's distal end aperture to its proximal end bore, regions of a non-uniform, and differing, conical angle of rotation,
• this differing conical angle between regions making that the incremental volume of each such region with linear distance along the axis of the housing's reservoir is not the same region to region,
• the differing incremental volume with linear distance along the axis of the housing being, from region to region, correlated with the visual scale markings upon the exterior of the housing to the end that the volume contained within the housing's interior reservoir should vary, between and one pair of successive scale markings and any other pair of successive scale markings, by greater than 2000% regardless that the lineal distance between said pairs of scale markings is, as aforesaid, in a ratio not greater than 500%.