... /DC signal output connectorCan be equipped with filter connectorOverload indicationFull scale +10±0.5dB, LED Power DC 6v, 4 pieces of 1 ... .5v batteries, with external DC voltage input holeWith AC ... accessories, it can be used to test with external 220v. Sound calibratorTL 6020 (94dB,1000Hz), TL6020A (94dB/114dB,1000Hz)It ...