Use of addition, subtraction, multiplication and the division of numbers including decimals and fractions; simple use of formulas, charts, tables, drawings, specifications, schedules, wiring diagrams, computer scanning devices, use of adjustable measuring instruments; checking of reports, forms, records and comparable data; where interpretation is required involving basic knowledge. Proficiency in the following skills: abilty to diagnose and repair mechanical, hydraulics, electrical, and pneumatics and the ability to read and understand mechanical, electrical, hydraulic and pneumatic drawings.