BASIC  DIMENSIONAL METROLOGY INTRODUCTION TO DIMENSIONAL MEASUREMENTS Brief History of Dimensional Measurements State of the Metric Dimensional Standards MATHEMATICS OF MEASUREMENTS Significant Digits Powers of Ten and Prefixes Scientific Notation Rounding  Numbers Using the Calculator Conversion from English to Metric LINEAR MEASUREMENTS Measurement Terms (Accuracy, Precision, Resolution, Range, Span) Coarse Measuring Devices (Tapes, Rules, Roll Counters, Glass Rules, Pi Tapes,                                             Dividers, Scales) Precision Measuring Devices (Vernier Calipers, Micrometers, Dial Indicators, Gage                                                Blocks, Electronic Comparators) REFERENCE PLANES Datum Planes Characteristics             Flatness, Perpendicularity, Stiffness, Hardness, Thermal Stability Surface Plates Measurements of Plane Characteristics (Auto-collimator and Laser Interferometer) GAGE BLOCKS Evolution of Gage Blocks Gage Block Specifications Gage Block Sets Combining and Wringing Gage Blocks Storage and Calibration VERNIER INSTRUMENTS Vernier Scales Using Vernier Calipers Using Depth Gages Using Dial Calipers Using Height Gages MICROMETERS Principles Of Operation Types of Micrometers Calibration MEASUREMENT BY COMPARISON – DIAL INDICATORS Measurement Principles Reading Dial Indicators Stands and Surface Plate Reference Comparison with Gage Blocks MEASUREMENT BY COMPARISON – ELECTRONIC COMPARATORS Measurement Principles Comparator Calibration THREAD MEASUREMENTS Introduction to Threads Terms and Theory Manufacturing Methods Thread Gages Measurement Over Wires Optical Comparator ANGLE MEASUREMENTS Introduction to Angles Trigonometry Measuring Instruments             Protractors             Squares             V Blocks             Sine Bars             Sine Blocks and Plates             Rotary Tables OPTICAL MEASUREMENTS Light Waves as Standards Waves and Rays Geometric Optics Types of Lenses Microscopes Optical Comparators Optical Flats Laser Interferometer COORDINATE MEASURING MACHINES Principle of Operation GD&T Introduction Different Styles Measuring Tips