level4dWhat Is the CAT 4 Level D Test? The Cognitive Abilities Test fourth edition (CAT 4) is an aptitude test desned to measure the cognitive abilities of students in year 7 in the United Kingdom orAbout this item 360 °Measurement 4 X 360°Green Laser s & 16 Laser s.HILDA Laser Level have 2 horizontal 360°plane, two vertical 360°planes. 16 laser s,