It is the most common method of quality control, data acquisition, and data analysis. Proper visual Inspection can reduce discontinuities to a great extent and improve quality of product. Visual inspection can be used in new manufacturing as well as refurbishment of existing product and during maintenance period. Various means of inspection use either, or all of the 4 human senses that are vision, hearing, touch and smell and/or any non-specialized inspection equipment.
It can be performed using different gauges, scales, measuring tapes, micrometers, vernier calipers, rulers, magnifying devices and remote video equipments.