The paper will be concerned with the description of tape recorder head measuring equipment type R‐57 now in development, for checking performance standards of all professional tape recording and reproducing units. The R‐57 unit does not require galvanic contact with the tape reproducing assembly. The R‐57 permits inductive coupling to the head assembly and measures recording current, high‐frequency bias, and frequency response of the reproduce head assembly at tape speeds of 30, 15,712, and334 in.per second. No test tape with its mechanical and electrical variations is required for this standard test. Special inductive pickup coil assemblies types K10 and K11 are briefly described. Tape reproducer equalization curves follow the norm of the CCIR recommendations No. 135. Further, disk reproducing equipment type EMT 930 will be briefly described in terms of very rigid disk reproducing standards in western Europe. The paper will also briefly touch upon a musical pitch generator producing the standard toneAat 440 cycles and will describe briefly circuitry in arriving at a typical oboe pitch at 440 cycles. A brief summary will be given of an instrument in use for accurate and direct measurement of wow and flutter as frequency modulated and amplitude modulated variations in reproducing equipment.