#Beaker tongs how to#
In this section are described methods on how to use a calibrated glass pipette. Keep the plastic away from flames or very high heat. Please note these are plastic coated, not silicone coated. Maximum jaw opening is 7' (180mm) and the length is 9.75' (248mm). Tongs are made from 1/4 thick steel rods for handling beakers. Figure 1.24: a+b) Applying suction to the pipette, c) Liquid withdrawn above the desired volume, d) The bulb is released and tip of the pipette sealed with a finger to maintain the liquid's position. Beaker Tongs 5.95 USD Info Made of zinc plated steel with a flat riveted joint and easy grip handles, our beaker tongs are plastic coated for a sure grip. "To-contain" pipettes may be useful for dispensing viscous liquids, where solvent can be used to wash out the entire contents. However, after draining a "to-contain" pipette, the residual liquid in the tip should be "blown out" with pressure from a pipette bulb. A "to-deliver" pipette is calibrated to deliver only the liquid that freely drains from the tip. After draining a "to-deliver" pipette, the tip should be touched to the side of the flask to withdraw any clinging drops, and a small amount of residual liquid will remain in the tip. to differentiate between these two kinds, and to-deliver pipettes are also marked with a double ring near the top (Figure 1.23b). Pipettes are calibrated " to-deliver" (TD) or " to-contain" (TC) the marked volume. \( \newcommand\) graduated pipettes with different markings: a) Bottom of pipettes, b) Top of pipettes
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