Mohr Type Measuring Pipettes
Mohr pipettes, also known as graduated pipettes, are laboratory tools used for measuring the volume of liquid dispensed. These are not as accurate as volumetric pipettes but are distinguished by their straight tube and graduation marks, which typically indicate volume changes in increments of 0.10 milliliters. The different volumes are marked by a series of lines on the pipette, similar to a graduated cylinder, and the measurement is taken by noting the difference between the initial and final volume readings.
The graduations are uniform and located on the transparent stem only, allowing for precise measurement within a controlled testing environment. The narrow tube design of the Mohr pipette ends in a tapered tip, which ensures exact drop reproducibility, critical for consistent laboratory results. The pipettes are often made from borosilicate glass due to its durability and resistance to thermal shock. This glass is typically heavy-walled and machine-drawn to ensure accurate bore dimensions and is further treated to have precision-formed jets and bevel ground ends to resist chipping. Graduation marks are usually applied with durable white enamel or amber stain, which are resistant to wear and chemicals.
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