A food blender has an optical analysis system comprising a sensor module having a light source and a light sensor for sensing reflected light, and a reference reflector. At least one of the sensor module and the reference reflector is mounted on a rotatable blade of the food blender at the base of the vessel of the blender. This provides a best location for optical analysis since this area is clear of foam. By using the blade as a mounting for at least part of the optical analysis system, an efficient use of space is ensured.
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