EXHIBIT 23 CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS Blonder Tongue Laboratories, Inc. We hereby consent to the incorporation by reference in Registration No. 333-15039 of Blonder Tongue Laboratories, Inc. on Form S-8 of our report dated February 18, 2000, relating to the consolidated financial statements and schedule of Blonder Tongue Laboratories, Inc. included in the Company's Annual Report on Form 10-K for the year ended December 31, 1999. BDO Seidman, LLP Woodbridge, New Jersey March 29, 2000