Specifications
| Applicable standard | ASTM D 3363 |
| Standard pencil | 9B-9H (20 pcs) |
Packing list
After-sales instructions
None
[Note] For after-sales services outside the Chinese mainland, if the instrument requires repair, the shipping and possible associated taxes shall be borne by the sender. Generation address of the manual: http://en.nbchao.com/p/1834/Specification.html , which is only used by users who purchase commodities from the NBCHAO.