$7.50	PID Control Parts I & II (PDF) Intro (Part I) and start (Part II) of Dave Gibbons' series on correct technical use of PID control of test chambers. Part I was published in TEST's October/November 2009 issue; Part II in TEST's December/January 2009-10 issue.
$7.50	PID Control Parts III (PDF) Third part in Dave Gibbons' series on correct technical use of PID control of test chambers. Part III was published in TEST's February/March 2010 issue.
$7.50	PID Control Parts IV (PDF) Fourth part in Dave Gibbons' series on correct technical use of PID control of test chambers. Part IV was published in TEST's April/May 2010 issue.
$19.00	PID Control Parts I thru IV (PDF Bundle) First five parts of Dave Gibbons' series on correct technical use of PID control of test chambers. The series began in TEST's October/November 2009 issue with the Intro (Part I), and Parts II, III, and IV were published in TEST's December/January 2009-10, February/March 2010, and April/May 2010 issues, respectively.
$7.50	Keys to good HALT and HASS Article by Daniel Sharpe published in TEST's August/September 2009 issue.