The L.S. Starrett Company, Tru-Stone Technologies Division

(A2LA Cert. No. 1580.01) 11/13/2025 Page 2 of 2 Parameter/Equipment Range CMC2, 3 (±) Comments Granite Metrology Accessories – Flatness/Straightness Perpendicularity/ Parallelism Parallelism Repeat Reading (Flatness of Local Area) Up to ±0.0004 in (12 to 300) in (diagonal) (12 to 480) in (diagonal) Up to 48 in Up to 0.0003 in (>0.0003 to 0.001) in (12 to 480) in (length) Up to 0.002 in 18 μin (4.6√D) μin (29√D) μin 8 μin/in 20 μin 67 μin (11√D) μin 28 μin Mikrokator Autocollimator Electronic level Pentaprism and autocollimator Electronic amp and gage head Electronic level Repeat-o-meter with 0.000 02 in indicator ___________________ 1 This laboratory offers commercial calibration service. 2 Calibration and Measurement Capability Uncertainty (CMC) is the smallest uncertainty of measurement that a laboratory can achieve within its scope of accreditation when performing more or less routine calibrations of nearly ideal measurement standards or nearly ideal measuring equipment. CMCs represent expanded uncertainties expressed at approximately the 95 % level of confidence, usually using a coverage factor of k = 2. The actual measurement uncertainty of a specific calibration performed by the laboratory may be greater than the CMC due to the behavior of the customer’s device and to influences from the circumstances of the specific calibration. 3 In the statement of CMC, D is the length of the diagonal in inches. 4 This scope meets the P112 Flexible Scope Policy.