GARDNER INSTRUMENTS STANDARDS GARDNER LABORATORY INC. TWO(2) CALIBRATION STANDARDS IN A PROTECTIVE CARRYING CASE AND CONSIST OF A HIGH GLOSS BLACK GLASS STANDARD AND A LOWER GLOSS WHITE CERAMIC TILE

GARDNER INSTRUMENTS STANDARDS GARDNER LABORATORY INC. TWO(2) CALIBRATION STANDARDS IN A PROTECTIVE CARRYING CASE AND CONSIST OF A HIGH GLOSS BLACK GLASS STANDARD AND A LOWER GLOSS WHITE CERAMIC TILE THE STANDARDS ARE 4-1/4 SQUARE AND APPROXIMATELY 5/16" THICK GARDNER SECULAR GLOSS STANDARD BLACK STANDARD NO. 1992-B GEOMETRY 60* VALVE 93 DATE 12/2/77 CALIB - CP WHITE STANDARD NO. 1992-W GEOMETRY 60* VALVE 37 DATE- 12/2/77 CALIB. - CP