MicroTools for Measurements: Kit 3; 20 measuring tools with standard tips Horizontal MicroRuler: Five 500 micrometer wide horizontal rulers with 25 micrometer gradations. Vertical MicroRuler: Five 1000 micrometer long vertical rulers with 25 micrometer gradations. Large MicroProtractor: Five 1000 micrometer diameter tools for measuring angles and radial distances/dimensions, with 15 degree and 50 micrometer gradations. Small MicroProtractor: Five 320 micrometer diameter tools for measuring angles and radial distances/dimensions, with 30 degree and 20 micrometer gradations.