Exhibit (a)(1)(C)

NOTICE OF GUARANTEED DELIVERY

For Tender of Shares of Common Stock

of

SUTRON CORPORATION, a Virginia corporation

at

$8.50 NET PER SHARE

Pursuant to the Offer to Purchase dated June 26, 2015

by

SATELITTE ACQUISITION CORP., a Virginia corporation and an

indirect wholly-owned subsidiary of

DANAHER CORPORATION, a Delaware corporation.

THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 5:00 P.M., NEW

YORK CITY TIME, ON MONDAY, JULY 27, 2015, UNLESS THE OFFER IS

EXTENDED.

This Notice of Guaranteed Delivery, or one substantially in the form hereof, must be used to accept the Offer (as defined below) if (i) certificates representing shares of common stock, par value $0.01 per share (the “Shares”), of Sutron Corporation, a Virginia corporation, are not immediately available, (ii) the procedure for book-entry transfer cannot be completed prior to the expiration of the Offer or (iii) time will not permit all required documents to reach Computershare Trust Company, N.A. (the “Depositary”) prior to the expiration of the Offer. This Notice of Guaranteed Delivery may be delivered by mail, facsimile transmission or overnight courier to the Depositary. See Section 3 of the Offer to Purchase (as defined below).

The Depositary for the Offer is:

COMPUTERSHARE TRUST COMPANY, N.A.

By First Class Mail: Computershare Trust Company, N.A. Attn: Corporate Actions Voluntary Offer P.O. Box 43011 Providence, RI 02940-3011 By Registered Mail or Overnight Courier: Computershare Trust Company, N.A. Attn: Corporate Actions Voluntary Offer 250 Royall Street, Suite V Canton, MA 02021

By Facsimile:

(For Eligible Institutions Only)

(617) 360-6810

Confirm Facsimile Transmission:

(781) 575-2332

This is for confirmation of a fax only. All questions regarding the offer should be directed to the Information Agent.

DELIVERY OF THIS INSTRUMENT TO AN ADDRESS, OR TRANSMISSION OF INSTRUCTIONS VIA FACSIMILE TRANSMISSION, OTHER THAN AS SET FORTH ABOVE WILL NOT CONSTITUTE A VALID DELIVERY.

THIS FORM IS NOT TO BE USED TO GUARANTEE SIGNATURES. IF A SIGNATURE ON A LETTER OF TRANSMITTAL IS REQUIRED TO BE GUARANTEED BY AN “ELIGIBLE INSTITUTION” UNDER THE INSTRUCTIONS THERETO, SUCH SIGNATURE GUARANTEE MUST APPEAR IN THE APPLICABLE SPACE PROVIDED IN THE SIGNATURE BOX ON THE APPROPRIATE LETTER OF TRANSMITTAL.

The Eligible Institution (as defined in the Offer to Purchase) that completes this form must communicate the guarantee to the Depositary and must deliver the Letter of Transmittal (as defined below) or an Agent’s Message (as defined in the Offer to Purchase) and certificates for Shares to the Depositary within the time period shown herein. Failure to do so could result in a financial loss to such Eligible Institution.

Ladies and Gentlemen:

The undersigned hereby tenders to Satellite Acquisition Corp., a Virginia corporation and an indirect wholly-owned subsidiary of Danaher Corporation, a Delaware corporation, upon the terms and subject to the conditions set forth in the offer to purchase, dated June 26, 2015 (as it may be amended or supplemented from time to time, the “Offer to Purchase”), and the related Letter of Transmittal (as it may be amended or supplemented from time to time, the “Letter of Transmittal” and, together with the Offer to Purchase, the “Offer”), receipt of which is hereby acknowledged, the number of shares of common stock, par value $0.01 per share (the “Shares”), of Sutron Corporation, a Virginia corporation, specified below, pursuant to the guaranteed delivery procedure set forth in Section 3 of the Offer to Purchase.

Number of Shares and Certificate No(s)

(if available)

Check here if Shares will be tendered by book entry transfer.

Name of Tendering Institution:                                                                                                                                     

DTC Account Number:                                                                                                                                                 

Dated:                     , 2015

Name(s) of Record Holder(s):

(Please type or print)

Address(es):                                                                                                                                                                   

(zip code)

Area Code and Tel. No                                                                                                                                                  

(Daytime telephone number)

Signature(s):                                                                                                                                                                   

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GUARANTEE

(Not to be used for signature guarantee)

The undersigned, an Eligible Institution (defined in Section 3 of the Offer to Purchase), hereby (i) represents that the tender of Shares effected hereby complies with Rule 14e-4 under the Securities Exchange Act of 1934, as amended and (ii) guarantees delivery to the Depositary, at one of its addresses set forth above, of certificates representing the Shares tendered hereby, in proper form for transfer, or a confirmation of a book-entry transfer of such Shares into the Depositary’s account at DTC (pursuant to the procedures set forth in Section 3 of the Offer to Purchase), in either case together with a properly completed and duly executed Letter of Transmittal (or facsimile thereof) or, in the case of a book-entry transfer, an Agent’s Message (defined in Section 3 of the Offer to Purchase), together with any other documents required by the Letter of Transmittal, all within three (3) NASDAQ (as defined in the Offer to Purchase) trading days after the date hereof.

Name of Firm:                                                                                                                                                            

Address:                                                                                                                                                                     

(Zip Code)    

Area Code and Tel. No.:                                                                                                                                          

(Authorized Signature)

Name:                                                                                                                                                                       

(Please type or print)

Title:                                                                                                                                                                          

Date:                                                                                                                                                                          

NOTE: DO NOT SEND CERTIFICATES REPRESENTING TENDERED SHARES WITH THIS NOTICE. CERTIFICATES REPRESENTING TENDERED SHARES SHOULD BE SENT WITH YOUR LETTER OF TRANSMITTAL.

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