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Veex FX45 and Veex FX82 are two of Veex's leading products for fiber test and analysis. The FX45 is a basic handheld device suitable for everyday use, while FX82 is an extensive fiber optics test suite and has been designed for professionals. The main differences between them are the test capabilities, accuracy, and mobility.

The FX45 is a light-weight, easy-to-use test instrument that was designed to be portable and convenient. It offers basic passive fiber testing for loss, length, and core-to-core alignment. The accuracy provided for loss and length is 0.2dB and 0.5m respectively. It is also equipped with a 2.5mm universal interface, making it compatible with most popular fiber connectors.

The FX82 is a significantly more powerful instrument, providing a comprehensive suite of test capabilities. It offers both passive and active fiber testing, increasing the range of testing to include bi-directional loss and dynamic range measurements as well as broader connector compatibility. It is also highly accurate with loss and length measurements with 0.05dB and 0.01m accuracy respectively. Moreover, the instrument itself is well constructed and durable with a reinforced casing, making it suitable for use in the field.

In summary, the Veex FX45 is a great entry-level fiber test instrument with basic capabilities, while the FX82 is a much more powerful and extensive solution. The FX45 is lighter and easier to use in remote locations, while theFX82 offers greater accuracy and more extensive feature set. Each instrument serves a unique purpose depending on the user's requirements.