The Crystal nVision Reference Recorder (photo) is an easy-to-use digital recorder used to both read and document hydrostatic pressure tests, offering precise, reliable information to ensure safety. The nVision’s rugged design makes it appropriate for the rough environments in which many pipelines are located. It is temperature compensated, so the accuracy of the recorder will not be degraded if it is used between –20 to 50°C (4 to 122°F). In addition to pressure, the nVision can also record temperature. The combination of pressure and temperature on the same graph provides useful information for the post-analysis of the test. The nVision Reference Recorder can store up to 1 million data points (as fast as 10 readings per second). — Ametek STC, San Luis Obispo, Calif.