The 548A Logic Clip light-emitting-diodes (LED’s) will indicate logic levels on most integrated circuit (IC) logicfamilies, including TTL, HTL, DTL, CMQOS, and NMOS. It displays, simultaneously, logic levels for all 8, 14 or 16 pins of a dual in-line IC which operates from a supply of 4 to 18 volts. The clip can test flip-flops Gates Radio Company Counter buffers,adders, and shift registers. All 16 input Gates Radio Company are electronically buffered to minimize loading on any IC being tested. Sixteen high-efficiency LED’s provide HIGH (LED on) and LOW (LED off) logic level indication. No Power Supply connections are necessary; the Logic Clip powers itself from the V. and ground pins of the IC under test.