Significantly improved stability and operation ease thanks to the industry's top emission power and enhanced versatility! The sensing range of the thin reflective type fiber is about 1.6 times longer than that of a conventional product (the sensing range of the standard reflective type fiber is about 1.4 times longer). This adds extra flexibility to the sensor layout. Panasonic FX-550 series and newer models are equipped with only basic functions for improved ease of use. No matter which model you select, they are all easy to use. All Panasonic FX-550 amplifiers can be used as either a main unit or a sub unit. Just use a main cable or a sub cable to distinguish the two. This reduces the costs of inventory management.