Billed as an environmentally friendly alternative to mercury tube switches, the Series DS-7300 bourdon tube pressure switch features an SPDT hermetically sealed snap-action switch. It boasts high sensitivity and reliability with an adjustable setpoint. Features include an external adjustment, visible calibrated dial, and fixed deadband. Price is $229.
Dwyer Instruments Inc., Box 373, Michigan City, IN 46361. (219) 879-8000. www.dwyer-inst.com.

Closed-Loop Quality Management Minimizes the Cost of Quality
Don Jasurda, Vice President, Dimensional Control Systems

Engineering, Freedom, and the 28th Amendment
Karl Stephens

Picking Glass Out of My Eyes
David Mantey, Editor, PD&D