**Exhibit 31.2.1**

**CERTIFICATION**

I, David M. Young, Chief Financial Officer of TESSCO TechnologiesIncorporated, certify that:

# 1.   I have reviewed this annual reporton Form 10-K, for the period ended April 1, 2007, of TESSCO TechnologiesIncorporated (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)   Designed such disclosurecontrols and procedures, or caused such disclosure controls and procedures tobe designed under our supervision, to ensure that material information relatingto the registrant, including its consolidated subsidiaries, is made known to usby others within those entities, particularly during the period in which thisreport is being prepared;

## b)   Evaluated theeffectiveness 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)   Disclosed in this reportany change in the registrant’s internal control over financial reporting thatoccurred during the registrant’s fourth fiscal quarter that has materiallyaffected, or is reasonably likely to materially affect, the registrant’sinternal 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)   All significant deficienciesand material weaknesses in the design or operation of internal control overfinancial reporting which are reasonably likely to adversely affect theregistrant’s ability to record, process, summarize and report financialinformation; and

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## b)   Any fraud, whether or not material, that involvesmanagement or other employees who have a significant role in the registrant’sinternal control over financial reporting.

| Date:   June 13, 2007 |   | By:    |   | /s/ David M. Young                             |
|---------------------------------|--------|--------|--------|------------------------------------------------|
|                            |   |   |   | David M. Young                                 |
|                            |   |   |   | Senior Vice President, Corporate Secretary and |
|                            |   |   |   | Chief Financial Officer                        |

 

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