**Exhibit 31.2.1**

**CERTIFICATION**

I, David M. Young, ChiefFinancial Officer of TESSCO Technologies Incorporated, certify that:

# 1.             I have reviewed this annual reporton Form 10-K, for the period ended March 26, 2006, of TESSCOTechnologies Incorporated (the “registrant”);

# 2.             Based on my knowledge, this reportdoes not contain any untrue statement of a material fact or omit to state amaterial fact necessary to make the statements made, in light of circumstancesunder which such statements were made, not misleading with respect to theperiod covered by this report;

# 3.             Based on my knowledge, thefinancial statements, and other financial information included in this report,fairly present in all material respects the financial condition, results ofoperations and cash flows of the registrant as of, and for, the periodspresented in this report;

# 4.             The registrant’s other certifyingofficer and I are responsible for establishing and maintaining disclosurecontrols and procedures (as defined in Exchange Act Rules 13a-15(e) and15d-15(e)) for the registrant and have:

## a)             Designedsuch disclosure controls and procedures, or caused such disclosure controls andprocedures to be designed under our supervision, to ensure that materialinformation relating to the registrant, including its consolidatedsubsidiaries, is made known to us by others within those entities, particularlyduring the period in which this report is being prepared;

## b)            Evaluatedthe effectiveness of the registrant’s disclosure controls and procedures andpresented in this report our conclusions about the effectiveness of thedisclosure controls and procedures, as of the end of the period covered by thisreport based on such evaluation; and

## c)             Disclosedin this report any change in the registrant’s internal control over financialreporting that occurred during the registrant’s fourth fiscal quarter that hasmaterially affected, or is reasonably likely to materially affect, theregistrant’s internal control over financial reporting; and

# 5.             The registrant’s other certifyingofficer and I have disclosed, based on our most recent evaluation of internalcontrol over financial reporting, to the registrant’s auditors and the auditcommittee of the registrant’s board of directors:

## a)             Allsignificant deficiencies and material weaknesses in the design or operation ofinternal control over financial reporting which are reasonably likely toadversely affect the registrant’s ability to record, process, summarize andreport financial information; and

## b)            Anyfraud, whether or not material, that involves management or other employees whohave a significant role in the registrant’s internal control over financialreporting.

| Date: June 19, 2006 | By:    |   | /s/ David M. Young                             |
|--------------------------|--------|--------|------------------------------------------------|
|                     |   |   | David M. Young                                 |
|                     |   |   | Senior Vice President, Corporate Secretary and |
|                     |   |   | Chief Financial Officer                        |

 

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