... .Dual channel frequency Radio Dual Channel Signal Level MeterFeature:level measurement, inclination ratiomeasurement, C/N, V ... current:)accompanying sound monitoring and backlight LCD.Singal Level MeterDetail Specification/Parameter: ) Input Frequency:Definition10KHzFrequency ... ± 2.5 dB (Input signal ≥ 80dB) Measuring frequency level:Range30 – 120dBµVAccuracy≤ ± 2dBDefinition0.1dBRF input impedance75 Ω ...