What Items To Unique Identify
All solicitations, contracts or delivery orders for tangible items delivered to the Government will require item unique identification or a DoD recognized unique identification equivalent, if:

All delivered items1 for which the Government's unit acquisition cost is $5,000 or more

Items for which the Government's unit acquisition cost is less than $5,000, when identified by the requiring activity as serially managed, mission essential, or controlled inventory

Items for which the Government's unit acquisition cost is less than $5,000, when the requiring activity determines that permanent identification is required

Regardless of value—

• Any DoD serially managed subassembly, component, or part embedded within a delivered item; and
• The parent item (as defined in 252.211-7003(a)) that contains the embedded subassembly, component, or part.

MIL 130 Compatibility
5.2.3.2 Two-dimensional Symbol. The two-dimensional symbol shall be the Data Matrix ECC 200 in accordance with ISO/IEC 16022. Unless otherwise specified [italics added], the module size shall be no smaller than 0.0075 inch (0.19 mm) and no larger than 0.025 inch (0.635 mm). Square symbol sizes shall not exceed one inch (25.4 mm). The larger dimension of rectangular Data Matrix symbols, as permitted by ISO/IEC 16022, shall not exceed one inch. Deviations to the stated module sizes and maximum overall symbol size shall be specified by contract if required [italics added].