<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<RESTATED>
<MULTIPLIER> 1,000

<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   YEAR                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1996             DEC-31-1996
<PERIOD-START>                             JAN-01-1996             JAN-01-1996             JAN-01-1996
<PERIOD-END>                               DEC-31-1996             JUN-30-1996             SEP-30-1996
<CASH>                                           2,204                   1,525                   1,897
<SECURITIES>                                     6,970                   6,989                   7,023
<RECEIVABLES>                                    6,640                  10,337                   6,782
<ALLOWANCES>                                       187                     216                     236
<INVENTORY>                                      7,870                   7,683                  10,643
<CURRENT-ASSETS>                                27,434                  27,352                  27,193
<PP&E>                                           7,037                   6,090                   6,563
<DEPRECIATION>                                   2,787                   2,289                   2,548
<TOTAL-ASSETS>                                  33,892                  33,384                  33,401
<CURRENT-LIABILITIES>                            4,099                   5,568                   4,945
<BONDS>                                            363                     448                     405
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                            52                      52                      52
<OTHER-SE>                                      28,253                  26,319                  27,089
<TOTAL-LIABILITY-AND-EQUITY>                    33,892                  33,384                  33,401
<SALES>                                         35,104                  18,589                  25,610
<TOTAL-REVENUES>                                35,104                  18,589                  25,610
<CGS>                                           20,572                  10,972                  15,091
<TOTAL-COSTS>                                   20,752                  10,972                  15,091
<OTHER-EXPENSES>                                     0                       0                       0
<LOSS-PROVISION>                                    80                      32                      55
<INTEREST-EXPENSE>                                  61                      31                      45
<INCOME-PRETAX>                                  4,008                   2,730                   2,997
<INCOME-TAX>                                     1,453                   1,010                   1,109
<INCOME-CONTINUING>                              2,565                   1,720                   1,888
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                     2,555                   1,720                   1,888
<EPS-PRIMARY>                                     0.50                    0.33                    0.36
<EPS-DILUTED>                                     0.46                    0.31                    0.34


</TABLE>