>Along the same lines: How do you mark down the original calibration on JW >508s and 509s ? I use a steel needle to scratch it into the brazed window >bezel but sometimes more scratches are added during handling and then it's >gone. Is there a marker pen that uses non-transparent non-removable ink >and has a fine tip ? I scratch it into the ceramic underside. Lots of protection (ie, sharp pins!) to keep them area from being handled. Andy ================================================================== Andy Kunz - Statistical Research, Inc. - Westfield, New Jersey USA ==================================================================