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The FVA-60B offers three attenuation display modes: Absolute (including insertion loss), Relative (in reference to 0.00 dB level) and x b (arbitrary value). Fourteen available wavelengths (1280 to 1580 nm): Matches your source wavelength to the nearest 10 nm for unbeatable accuracy. The FVA-60B features three complementary power sources for extended operation: a rechargeable NiCd battery, a 9 V alkaline backup battery and an AC adapter/charger for continuous operation.