Exhibit 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

I, Harley E Barnes III, certify that:



|1. | I have reviewed the quarterly report on Form 10-Q for the period ended February 29, 2008 of RF Monolithics, Inc., filed with the Securities and Exchange Commission on
April 14, 2008 (the Report);
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|2. | Based on my knowledge, the Report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the
circumstances under which such statements were made, not misleading with respect to the period covered by the Report;
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|3. | Based on my knowledge, the financial statements, and other financial information included in the Report, fairly present in all material respects the financial condition, results of
operations and cash flows of the registrant as of, and for, the periods presented in the Report;
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|4. | The registrants other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e)
and 15d-15(e)) for the registrant and have:
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| | a) | Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information
relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which the Report is being prepared;
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| | b) | [Omitted in reliance on SEC Release No. 33-8238; 34-47986 Section III.E.];
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| | c) | Evaluated the effectiveness of the registrants disclosure controls and procedures and presented in the Report our conclusions about the effectiveness of the disclosure
controls and procedures, as of the end of the period covered by the Report based on such evaluation; and
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| | d) | Disclosed in the Report any change in the registrants internal control over financial reporting that occurred during the registrants most recent fiscal quarter (the
registrants fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrants internal control over financial reporting; and
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|5. | The registrants other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrants
auditors and the audit committee of registrants board of directors (or persons performing the equivalent functions):
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| | a) | All significant deficiencies and material weaknesses in the design or operation of internal controls over financial reporting which are reasonably likely to adversely affect the
registrants ability to record, process, summarize and report financial information; and
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| | b) | Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrants internal control over financial reporting.
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|                     |  |                        
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|Date: April 14, 2008 |  | /s/ Harley E Barnes III
|                     |  | Harley E Barnes III    
|                     |  | Chief Financial Officer