Size	Laboratory Grade AA		Inspection Grade A		Toolroom Grade B
Size	Order No.	Overall Accuracy	Order No.	Overall Accuracy	Order No.	Overall Accuracy
6 x 6 x 2	6X6X2AASTCS	±.000025	6X6X2ASTCS	±.000050	6X6X2BSTCS	±.0001
8 x 12 x 2	8X12X2AASTCS	±.000025	8X12X2ASTCS	±.000050	8X12X2BSTCS	±.0001
9 x 12 x 3	9X12X3AASTCS	±.000025	9X12X3ASTCS	±.000050	9X12X3BSTCS	±.0001
12 x 18 x 2	12X18X2AASTCS	±.000025	12X18X2ASTCS	±.000050	12X18X2BSTCS	±.0001
18 x 24 x 3	18X24X3AASTCS	±.000037	18X24X3ASTCS	±.000075	18X24X3BSTCS	±.00015

Granite Base with Certification:

1" Diameter x 10" High Column Standard Size
Optional Column Sizes Quoted
Fine Adjustment on Clamp
Accepts all AGD Indicators
Approximately 2-1/2" Throat Clearance Measured From Column to Colum to Centerline of Indicator Stem
Dial Indicator NOT Included

For Standard 1" Diameter Columns

Determine the location of column
Mounting location for column must be specified when ordering rectangular plates. Notate: "Standard" or "Optional"

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PG Compstand Standard