HENRY BROS. ELECTRONICS, INC. AND
SUBSIDIARIES

EXHIBIT 31.3

CERTIFICATION PURSUANT TO RULE 13a-14
OF THE SECURITIES EXCHANGE ACT OF 1934 as adopted pursuant to section 302 of
the Sarbanes-Oxley act of 2002
of
Chief Financial Officer

I, John P.
Hopkins, Chief Financial Officer of Henry Bros. Electronics, Inc. (the
Registrant), certify that:

| |    |                                                                                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                                                                                                                                                                    
| | -- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| | 1. | I have
 reviewed this annual report on Form 10-K of the Registrant;                                                                                                                                                                                                                                           
| |    |                                                                                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                                                                                                                                                                    
| | 2. | Based on my
 knowledge, this 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 this report;
| |    |                                                                                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                                                                                                                                                                    
| | 3. | Based on my knowledge,
 the financial statements, and other financial information included in this
 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 this report;                   
| |    |                                                                                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                                                                                                                                                                    
| | 4. | The
 Registrants other certifying officers 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)) and internal controls (as defined in Exchange Act Rules 13(a)-15(f) for the
 Registrant and have:          
| |    |                                                                                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                                                                                                                                                                    
| |    | 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 this report is being
 prepared;
| |    |                                                                                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                                                                                                                                                                    
| |    | b)                                                                                                                                                                                                                                                                                                             | Designed such internal controls over financial reporting or caused
 such internal control over financial reporting to be designed under our
 supervision to provide reasonable assurance regarding the reliability of
 financial reporting and the preparation of financial statements for external
 purposes in accordance with generally accepted accounting principles;         
| |    |                                                                                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                                                                                                                                                                    
| |    | c)                                                                                                                                                                                                                                                                                                             | Evaluated the effectiveness of the Registrants disclosure controls
 and procedures and presented in this report our conclusions about the
 disclosure controls and procedures, as of the end of the period covered by
 this report based upon such evaluation; and                                                                                                                
| |    |                                                                                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                                                                                                                                                                    
| |    | d)                                                                                                                                                                                                                                                                                                             | Disclosed in this report any changes in the Registrants internal
 financial reporting that occurred during the Registrants most recent fiscal
 quarter (the Registrants fourth quarter) that has materially affected or is
 reasonably likely to materially affect, the Registrants internal control
 over financial reporting.                                                  
| |    |                                                                                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                                                                                                                                                                    
| | 5. | The Registrants other certifying officers 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 the
 Registrants board of directors (or persons performing the equivalent
 function):           
| |    |                                                                                                                                                                                                                                                                                                               
| |    | a)                                                                                                                                                                                                                                                                                                             | All significant deficiencies and material weaknesses in the design or
 operation of internal control over financial reporting which are reasonably
 likely to adversely affect the Registrants ability to record, process,
 summarize and report financial data; and                                                                                                              
| |    |                                                                                                                                                                                                                                                                                                                |                                                                                                                                                                                                                                                                                                                                                                                    
| |    | 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.                                                                                                                                                                                                       

|                      |       |                         
|--------------------- | ----- | ------------------------
|Date: March
 31, 2008 |       | /s/ John P.
 Hopkins    
|                      |       |                         
|                      | Name: | John P.
 Hopkins        
|                      |       | Chief
 Financial Officer

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