Honeywell’s Truline recorder is a one to four-channel, microprocessor- ALM F CHN 1 RSP 1559 % ruline based, circular chart recorder. Its “one-pen” stylus printhead produces up to four analog traces and prints alphanumeric chart data on a blank heat-sensitive chart. All four traces share the same time line reference which the Truline prints. This eliminates the error caused by pen alignment offsets in conventional pen designs. Since the Truline prints the chart and generates the analog traces at the same time, there is no error due to variations in chart size caused by changes in temperature and humidity.