How to handle calibration weights: Ten practical tips

How you handle, clean and store test weights can make a big difference in the accuracy of your weighing processes. Test weights must be handled with care.
This video covers the following topics:
- Store weights in original packing
- Store weights near the balance
- Handle weights with care
- Clean according to OIML/ASTM recommendation
- Use specialized handles for bigger weights
- Inspect for damage prior to use
- Do not touch weights with bare hands
- Do not forget periodic calibration of test weights
- Do not use a weight with dust or water on its surface
- Do not clean with abrasive or caustic chemicals
www.mt.com/global/en/home/lib...
0:14 - Store weights in original packing
0:33 - store weights near the balance
0:59 - handle weights with care
1:19 - Clean according to OIML/ASTM recommendation
1:37 - Use specialized handles for bigger weights
1:59 - Inspect for damage prior to use
2:14 - Do not touch weights with bare hands
2:41 - Do not forget periodic calibration of test weights
2:51 - Do not use a weight with dust or water
3:04 - Do not clean with abrasive chemicals

[@WaschyNumber1]

Thank you for this important video 👍

[@METTLERTOLEDOLaboratory]

Thank you for watching!

[@krisma12234]

for some reason when they forced the tweezers to hold the 2kg weight that made me laugh lol. i've definitely done that a few time

[@METTLERTOLEDOLaboratory]

Thank you for watching!

[@jenniferjackson1853]

Am looking for information on the proper cleaning of the CarePac weights, fork, and tweezers. Do you have a video link to that?

[@METTLERTOLEDOLaboratory]

Hello Jennifer. All our weights need to follow same cleaning procedure including the CarePac weights. For further information on proper, please take a look at the following guides and videos: kzbin.info/www/bejne/m4bbXmCdnZaXiKs www.mt.com/global/en/home/library/tips-and-tricks/laboratory-weighing/poster-correct-test-weight-handling.html , www.mt.com/us/en/home/library/guides/laboratory-weighing/correct-test-weight-handling-guide.html

[@devangpatel3298]

Superb

[@METTLERTOLEDOLaboratory]

Thanks 🤗

[@YourWealthCome]

I just got an electronic balance and it says Never touch the included weight with your skin. Is it because of oils or is the weight itself toxic?

[@METTLERTOLEDOLaboratory]

Dear Timothy, Weights should never be touched with bare hands to avoid contamination from skin, oil or other substances. If you need more information, you can get in touch with the local market organization directly. For more information, contact us: www.mt.com/us/en/home/site_content/aboutus/about-us-global-presence.html

[@dedamarsovac]

How much do properly handled test weights actually change in mass in the interval of periodic calibration? ( 1 year?) If they were to be calibrated/checked every 10 years or so, would that mean that the calibration is valid for the whole 10 year period if the mass of the weight is in spec? What are the chances for 200.00g weight to become 200.33g as shown in video? :D They'd really have to be poorly handled for that I guess.

[@METTLERTOLEDOLaboratory]

Dear Ivkan, If weights are properly handled and stored, the weights will still be good after 10 years, but you are only 100% sure if you check the weights periodically and re-calibrate them. How often a weight should be re-calibrated depends very much on how often it is used and and how the weight is handled.

[@kalpeshpatil2747]

Why there is 2 weights of 2mg, 20mg, 2g, 20g, 200g. Why not other weights?

[@METTLERTOLEDOLaboratory]

Hi, You refer to the combination of standard OIML weight sets. They intended to combine weights to every summation weight value like 1, 2, 3, 4 and 5 mg etc. (for the 4 mg you need 2 times 2 mg!). There are other strategies in parts of the world with the same aim which employ e.g. a "3" nominal value.

[@miguelpacahualacristobal3596]

Hello, tip 6 is not clear to me, why is one form not correct? In tip 7: if the 2kg weight has the special accessory to move the weight, why take it by hand (wearing gloves), by doing this heat is also transmitted to the weight.

[@METTLERTOLEDOLaboratory]

Dear Miguel, Thanks for your inquiry. On tip 6 the picture on the left shows the weight with damage on the top while the picture on the right indicates that the weight is being used correctly because there's no scratches or damages. As for tip 7 it shows how to handle the weights with a clean glove to prevent contamination. Since you only have the weight in your hands for a few seconds, there is no heat transfer. If there's a need to hold the weight longer than a few seconds, you should use a suitable tool such as tweezers or weight forks. For more info on how to handle weights, please visit www.mt.com/global/en/home/library/guides/laboratory-weighing/correct-test-weight-handling-guide.html?cmp=smo_GLO_YT_LAB_OTH_KZbin_LAB_eUx--gh1dRI