If your pipette has been recalibrated since purchase, you should check with your calibration service to determine which standards were used, and consider comparing your Checkit readings to that standard rather than to the manufacturer’s standard. Note that ISO 8655 standards differ from the manufacturer’s standards. If you choose to compare your Checkit readings to the manufacturer’s specifications, remember to account for both accuracy and precision when determining what range is acceptable. Briefly, accuracy describes how close the mean of delivered volumes is to the stated volume, and precision describes the distribution of the volumes around the mean. Most pipette manufacturers provide specifications for both the accuracy and precision of their pipettes. Because the Checkit directly measures delivered volume rather than relying on gravimetric analysis, there is also no need to use correction calculations that account for these factors. This can help identify variation in delivered volume due to pressure, humidity, or temperature differences between the calibration environment and the experimental environment. The markings on the Checkit reflect this variation.Ī note on environment: One advantage of the Checkit is that it can be used in the same room in which the experiment will be conducted. When a pipette is used near the bottom of its range, the measured volumes will vary more, and are also more strongly affected by slight variations in pipetting style or environmental factors like humidity. Piston pipettes are most accurate at or near their nominal volume (the maximum volume the pipette can deliver). If your institution requires pipette calibration on a specific schedule, you should adhere to this schedule and use the Checkit as an extra verification step between scheduled calibrations.Įxpected performance at different volumes The Pipette Checkit® is a tool to identify potential volume delivery errors for pipettes. Add to cart Questions Request a Call Back Description Additional information Checkit 50 uL Pipette Checkit for on the spot evaluation of your pipette’s accuracy. This tool allows users to check the accuracy of their pipettes in seconds right in the lab. Checkit Pro 50 L, box of 5 75.50 Pipette Checkit for pipette calibration verification, for 50 uL pipettes. Pipette Checkit Pro model for 20uL pipettes by Next Advance.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |