Component Design Northwest, Inc.
PO Box 10947 Portland, OR 97296
Phone: (800) 338-5594 or (503) 225-0900
Fax: (800) 879-2364 or (503) 226-0924www.cdn-timeandtemp.com
I had one of the 450s a few years ago with the red-plastic tip. Design flaw, the plastic would chip and expose the thermocouple = failure. Good news, the company acknowledged the flaw and replaced the unit. (Think about it, a five year warranty on a $15.00 product!!!) No problems.
Either return the unit to Williams for exchange, or contact CDN. They are VERY customer friendly, even though their stuff is made in China.