<P> Pipette robots are capable of manipulating the pipettes as humans would do . </P> <P> Pipette recalibration is an important consideration in laboratories using these devices . It is the act of determining the accuracy of a measuring device by comparison with NIST traceable reference standards. . Pipette calibration is essential to ensure that the instrument is working according to expectations and as per the defined regimes or work protocols . Pipette calibration is considered to be a complex affair because it includes many elements of calibration procedure and several calibration protocol options as well as makes and models of pipettes to consider . </P> <P> Proper pipetting posture is the most important element in establishing good ergonomic work practices . During repetitive tasks such as pipetting, maintaining body positions that provide a maximum of strength with the least amount of muscular stress is important to minimize the risk of injury . A number of common pipetting techniques have been identified as potentially hazardous due to biomechanical stress factors . Recommendations for corrective pipetting actions, made by various US governmental agencies and ergonomics experts, are presented below . </P> <Dl> <Dt> Winged elbow pipetting </Dt> <Dd> Technique: elevated, "winged elbow". The average human arm weighs approximately 6% of the total body weight . Holding a pipette with the elbow extended (winged elbow) in a static position places the weight of the arm onto the neck and shoulder muscles and reduces blood flow, thereby causing stress and fatigue . Muscle strength is also substantially reduced as arm flexion is increased . </Dd> <Dd> Corrective action: Position elbows as close to the body as possible, with arms and wrists extended in straight, neutral positions (handshake posture). Keep work items within easy reach to limit extension and elevation of arm . Arm / hand elevation should not exceed 12" from the worksurface . </Dd> </Dl>

Which of the pipets you used in lab would you use to measure 0.5 ml