The B&K Precision 1257 NTSC Test Pattern Generator is a low-cost, precision, television/video signal generator. It generates a variety of test signals and patterns for comprehensive testing, servicing, and adjustment of video and television equipment. Its application includes television systems, video cassette recorders, and video disc players.

The instrument can generate many different patterns, each of which is available as a composite or S-video signal. The patterns include standard NTSC color bars, staircase, black rater, and a variety of purity and convergence patterns. An engineer or technician with strong knowledge of video isolates almost any video problem.