... (F), Slow(S), Impulse (I). Max hold, with AC/DC signal output connectorCan be equipped with filter connectorOverload indicationFull scale +10±0.5dB ... 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 ...