<ARTICLE>                  5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED CONSOLIDATED BALANCE SHEETS AT DECEMBER 31, 1999 (UNAUDITED)
AND THE CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS FOR THE THREE
MONTHS ENDED DECEMBER 31, 1999 (UNAUDITED) AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER>      1,000

                                                  
<PERIOD-TYPE>                                        9-MOS
<FISCAL-YEAR-END>                                           MAR-31-2000
<PERIOD-START>                                              APR-01-1999
<PERIOD-END>                                                DEC-31-1999
<CASH>                                                            1,540
<SECURITIES>                                                      5,151
<RECEIVABLES>                                                     1,989
<ALLOWANCES>                                                       (319)
<INVENTORY>                                                       4,117
<CURRENT-ASSETS>                                                 13,039
<PP&E>                                                           16,776
<DEPRECIATION>                                                   12,133
<TOTAL-ASSETS>                                                   21,152
<CURRENT-LIABILITIES>                                             2,420
<BONDS>                                                               0
<COMMON>                                                             98
<PREFERRED-MANDATORY>                                                 0
<PREFERRED>                                                           0
<OTHER-SE>                                                       18,634
<TOTAL-LIABILITY-AND-EQUITY>                                     21,152
<SALES>                                                          12,314
<TOTAL-REVENUES>                                                 12,314
<CGS>                                                             6,918
<TOTAL-COSTS>                                                     6,918
<OTHER-EXPENSES>                                                  3,770
<LOSS-PROVISION>                                                      0
<INTEREST-EXPENSE>                                                    1
<INCOME-PRETAX>                                                   1,900
<INCOME-TAX>                                                     (1,710)
<INCOME-CONTINUING>                                               3,610
<DISCONTINUED>                                                        0
<EXTRAORDINARY>                                                       0
<CHANGES>                                                             0
<NET-INCOME>                                                      3,610
<EPS-BASIC>                                                         .37
<EPS-DILUTED>                                                       .37