# Primary Unit of measure in the Item Master (Product)

**URL:** <https://www.dolibarr.org/forum/t/primary-unit-of-measure-in-the-item-master-product/19684>\
**Category:** Using my Dolibarr\
**Tags:** Windows\
**Created:** [October 20, 2020, 4:06am UTC](https://www.dolibarr.org/forum/t/primary-unit-of-measure-in-the-item-master-product/19684 "2020-10-20T04:06:36Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![akkakm](https://www.dolibarr.org/forum/letter_avatar_proxy/v4/letter/a/ecccb3/32.png) [@akkakm](https://www.dolibarr.org/forum/u/akkakm)\
**Post date:** [October 20, 2020, 4:06am UTC](https://www.dolibarr.org/forum/t/primary-unit-of-measure-in-the-item-master-product/19684/1 "2020-10-20T04:06:36Z")

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Hi,  
I’m a new in Dolibarr, I did not find where to define a primary unit of measure in the item master (Product), and there is no conversion of unit of measure. I want to define a primary UoM in the item master like KG or TON, and I sell by Meter.  
Any help, I appreciate  
Regards  
Mo

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**Author:** ![futurehousestore](https://www.dolibarr.org/forum/letter_avatar_proxy/v4/letter/f/8e8cbc/32.png) [@futurehousestore](https://www.dolibarr.org/forum/u/futurehousestore)\
**Post date:** [October 21, 2020, 4:04pm UTC](https://www.dolibarr.org/forum/t/primary-unit-of-measure-in-the-item-master-product/19684/2 "2020-10-21T16:04:06Z")

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Hi Mo,  
Check out this page [Other setup](https://wiki.dolibarr.org/index.php/Setup_Other) you can find many useful things like the ones below:

> MAIN\_VOLUME\_DEFAULT\_ROUND ► Accuracy of volume (number of decimals)  
> MAIN\_VOLUME\_DEFAULT\_UNIT ► Default unit for weight (0=kg, -3=g, …)  
> MAIN\_WEIGHT\_DEFAULT\_ROUND ► Accuracy of weight (number of decimals)  
> MAIN\_WEIGHT\_DEFAULT\_UNIT ► Default unit for weight (0=kg, -3=g, …)

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**Author:** ![akkakm](https://www.dolibarr.org/forum/letter_avatar_proxy/v4/letter/a/ecccb3/32.png) [@akkakm](https://www.dolibarr.org/forum/u/akkakm)\
**Post date:** [October 22, 2020, 3:25am UTC](https://www.dolibarr.org/forum/t/primary-unit-of-measure-in-the-item-master-product/19684/3 "2020-10-22T03:25:24Z")

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> [@futurehousestore](#):
>
> Default unit for weight (0=kg, -3=g, …)

Thanks, I’ll use MAIN\_WEIGHT\_DEFAULT\_UNIT and I’ll see if it works or non.  
Regards  
Mo  
Dolibarr 12.0.3