The Lovibond® Petroleum Oils Comparator is an ergonomical 3-field instrument for visually determining the ASTM colour of samples by direct comparison with coloured glass standards. It incorporates the 16 glass standards which make up the scale in a pair of discs

ASTM Color as specified in ASTM D1500 is a single number colour scale for grading petroleum products. The scale is defined by 16 glass standards of specified luminous transmittance and chromaticity, graduated in steps of 0.5 from 0.5 for the lightest colour to 8.0 for the darkest. It is intended for a variety of petroleum products such as lubricating oils, heating oils, diesel fuel oils, mineral insulating oil and solid petroleum waxes and has been adopted by other standardising