An apparatus for measuring the light scattering properties of a liquid suspension of particles, comprising manifold means (19, 20), a sample cell being essentially in the form of a cylinder, the sample cell including an interior bore which is disposed along a diameter within a horizontal plane extending perpendicular to the axis of the cylinder and is configured to hold a liquid suspension of particles and to receive a fine beam of light to pass through said bore such to illuminate the liquid suspension, sealing means provided at both openings of said bore and configured to permit the incorporation of said cell into said manifold means (19, 20) such to allow the flow of a liquid suspension therethrough, a light scattering photometer comprising a light source for emitting a light beam, and a plurality of detectors lying on a concentric detection ring, wherein said manifold means (19, 29) is configured to hold said cell in alignment with the light scattering photometer, fittings configured to permit the introduction and flow of said liquid suspension through said bore and optical means configured to permit the passage of the light beam through said bore such that the light beam illuminates the liquid suspension flowing through said bore, characterized in that said cell comprises an exterior surface configured to act as both a lateral lens and a vertical lens to focus light, which is scattered from said illuminated bore into a range of azimuthal scattering angles (Θ g), to a single corresponding focal point on a concentric detection ring, and the apparatus comprises a concentric detection ring lying in the horizontal plane and comprising a plurality of optical detectors arranged around the ring, each detecting scattered light over a corresponding range of azimuthal scattering angles. manifold means (19, 20), a sample cell being essentially in the form of a cylinder, the sample cell including an interior bore which is disposed along a diameter within a horizontal plane extending perpendicular to the axis of the cylinder and is configured to hold a liquid suspension of particles and to receive a fine beam of light to pass through said bore such to illuminate the liquid suspension, sealing means provided at both openings of said bore and configured to permit the incorporation of said cell into said manifold means (19, 20) such to allow the flow of a liquid suspension therethrough, a light scattering photometer comprising a light source for emitting a light beam, and a plurality of detectors lying on a concentric detection ring, wherein said manifold means (19, 29) is configured to hold said cell in alignment with the light scattering photometer, fittings configured to permit the introduction and flow of said liquid suspension through said bore and optical means configured to permit the passage of the light beam through said bore such that the light beam illuminates the liquid suspension flowing through said bore, characterized in that said cell comprises an exterior surface configured to act as both a lateral lens and a vertical lens to focus light, which is scattered from said illuminated bore into a range of azimuthal scattering angles (Θ g), to a single corresponding focal point on a concentric detection ring, and the apparatus comprises a concentric detection ring lying in the horizontal plane and comprising a plurality of optical detectors arranged around the ring, each detecting scattered light over a corresponding range of azimuthal scattering angles.