EXHIBIT 12 Apogent Technologies Inc. Computation of Ratio of Earnings to Fixed Charges June 30, 2002 Nine Months Fiscal Year Ended September 30, Ended --------------------------------------------------------------------- June 30, 1997 1998 1999 2000 2001 2002 ---------- ---------- ---------- ---------- ---------- ---------- Fixed Charges: Interest expense 24,999 33,772 40,073 48,684 48,698 30,804 Deferred financing 152 151 224 533 563 2,680 1/3 Rental expense 1,076 1,343 2,235 3,145 3,751 3,410 ------------------------------------------------------------------ ---------- 26,227 35,266 42,532 52,362 53,012 36,894 Earnings: Pre tax income from continuing operations 73,996 86,836 127,392 144,325 180,739 155,945 Add: Fixed charges 26,227 35,266 42,532 52,362 53,012 36,894 Earnings 100,223 122,102 169,924 196,687 233,751 192,839 Ratio of Earnings to Fixed Charges 3.8 3.5 4.0 3.8 4.4 5.2 ================================================================== ========== Rental Expense 3,229 4,028 6,704 9,434 11,253 10,230 ================================================================== ==========