<ARTICLE>      5 
<LEGEND>       THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED
               FROM THE ACCOMPANYING CONDENSED CONSOLIDATED FINANCIAL
               STATEMENTS AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO
               SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000 
       
                                                     
<PERIOD-TYPE>                        3-MOS                 3-MOS
<FISCAL-YEAR-END>                    MAY-31-1998           MAY-31-1997
<PERIOD-START>                       DEC-01-1997           DEC-01-1996
<PERIOD-END>                         FEB-28-1998           FEB-28-1997
<CASH>                                  11,820                 2,079
<SECURITIES>                            10,844                     0
<RECEIVABLES>                           11,629                 7,737
<ALLOWANCES>                               368                   221
<INVENTORY>                             10,626                10,821
<CURRENT-ASSETS>                        45,803                21,320
<PP&E>                                   8,060                 9,367
<DEPRECIATION>                           6,454                 7,743
<TOTAL-ASSETS>                          50,854                23,887
<CURRENT-LIABILITIES>                   11,152                15,224
<BONDS>                                      0                     0
<PREFERRED-MANDATORY>                        0                     0
<PREFERRED>                                  0                     0
<COMMON>                                    69                    43
<OTHER-SE>                              39,467                 8,304
<TOTAL-LIABILITY-AND-EQUITY>            50,854                23,887
<SALES>                                 11,567                10,745
<TOTAL-REVENUES>                        11,567                10,745
<CGS>                                    6,907                 6,364
<TOTAL-COSTS>                            6,907                 6,364
<OTHER-EXPENSES>                         3,345                 3,379
<LOSS-PROVISION>                             0                     0
<INTEREST-EXPENSE>                           0                     0
<INCOME-PRETAX>                          1,657                   571
<INCOME-TAX>                               826                   (19)
<INCOME-CONTINUING>                        831                   590
<DISCONTINUED>                               0                     0
<EXTRAORDINARY>                              0                     0
<CHANGES>                                    0                     0
<NET-INCOME>                               831                   590
<EPS-PRIMARY>                            $0.12                 $0.14
<EPS-DILUTED>                            $0.12                 $0.13