RUIZHI Digital Caliper 150mm 6inch Electronic Vernier Caliper Micrometer Measuring Tool with LCD Display Auto - Off Feature Ruler for Household DIY Measurment: Amazon.co.uk: Business, Industry & Science
Types of Measurement Direct Measurement : In direct measurement, the meaning of the measurement and the purpose of the processing operation are identical. - ppt download
Measurements tools | PPT
Direct measuring instrument and Indirect measuring instruments | Direct vs Indirect Measurement - YouTube