The SPECTRO ICP-OES instruments are the only instruments with a standard 0.75 meter polychromator with a high resolution grating for optimal sensitivity of all wavelengths between 165 and 770 nanometers in the first order. Also the SPECTRO ARCOS is the only instrument that operates without the need for a chiller to cool the plasma torch. This instrumentation does not consume Argon or Nitrogen as a monochromator purge gas and does not need a vacuum pump to evacuate it either. These items conserve precious Argon and thusly save operating costs. SPECTRO is the sole manufacturer of the instrument and it must adhere to 711th protocols.

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