Which of the following instruments is used for precision layout?

The instrument combination of a dial indicator height gauge and a scriber attachment is ideal for precision layout due to its ability to provide accurate measurements and highly precise layout capabilities. The dial indicator height gauge allows for fine height adjustments and can measure small increments, making it extremely useful for ensuring that layouts are exact. When combined with a scriber attachment, it enables users to mark precise lines or points on materials, thus ensuring a high level of accuracy in layout work.

This precision is essential in machining processes where even minor discrepancies can result in significant errors in the final product. The use of this tool enhances efficiency and accuracy in layout tasks, especially when transferring measurements and ensuring that features are laid out precisely according to specifications.