This instrument uses an extremely bright yellow LED to serve as a light source for any refractometer that requires external illumination. With a wave length of 590nm, the light matches the calibration of most refractometers and gives a clear, uncolored line on the scale. An adjustable foot lets you align the light with the aperture of almost any refractometer. This lamp is powered by a supplied lithium battery. 1-year manufacturer's warranty. Approved by the Gemmological Association of Great Britain Refractometer shown for illustration purposes only.
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