It depends on whether you have a witness and whether the witness has a witness certificate. If there is a witness card, there will be a witness card number on the card. If the witness does not apply for a witness card, just fill in the name of the witness unit and witness. If witness card number is filled in, the inspection category is: witness inspection.

Purpose of witness sampling:

That is, under the witness of the personnel of the construction unit or supervision unit, the construction personnel take samples at the scene and send them to the laboratory for testing. Witnesses must go through the training and examination of the engineering quality supervision station and obtain the witness certificate before taking up their posts.

The sampling and inspection witness of each project shall be authorized in writing by the project construction unit and appointed as the construction or supervision personnel of the project site.