# INSUNITSDEFSOURCE System Variable [GstarCAD 2027](Help%20System/GSTARCAD/2027/Index.md) → [System Variables](Help%20System/GSTARCAD/2027/System%20Variables/(System%20Variables).md) → [I](Help%20System/GSTARCAD/2027/System%20Variables/I/(I).md) ## Function Description: The INSUNITSDEFSOURCE system variable is used to set the original content unit value when the INSUINTS system variable set to be 0. | | | | --- | --- | | Type | Integer | | Saved in | Registry | | Initial value | 1 | | Range | 0 ~ 20 | ## System Variable Value: **0:** unspecified(no units) **1:** inches **2:** feet **3:** miles **4:** millimeters **5:** centimeters **6:** meters **7:** kilometers **8:** micro inches **9:** mils **10:** yards **11:** angstroms **12:** nanometers **13:** microns **14:** decimeters **15:** dekameters **16:** hectometers **17:** gigameters **18:** astronomical units **19:** light years **20:** parsecs --- [Original help](https://www.gstarcad.net/help/GstarCAD_2027_en-US/detail/systemVariables_Igsv/INSUNITSDEFSOURCE.html) · © Gstarsoft Co., Ltd.