Elenco LP-425 Logic Pulser Soldering Practice KitHandy device for inspecting and repairing logic circuits By injecting a signal directly to the circuit, you can avoid removing the ICs or other circuit components Operates by producing a transient current for a short period of time and will not harm components Signal frequency can be set to 5Hz or 400Hz SOLDERING REQUIRED ASSEMBLY REQUIRED Build your own logic pulser with this soldering practice kit. Includes a step by step illustrated assembly