New instruments are described for the measurement of both job‐related and non‐job mental health. These cover two axes of affective well‐being, based upon dimensions of pleasure and arousal, and also reported competence, aspiration and negative job carry‐over. Baseline data are presented from a sample of 1686 job‐holders, and earlier uses of the well‐being scales are summarized. The instruments appear to be psychometrically acceptable, and are associated with demographic and occupational features in expected ways. For example, older employees report greater job‐related well‐being; occupational level is positively correlated with job depression‐enthusiasm but negatively associated with job anxiety‐contentment; depression‐enthusiasm is more predictable from low‐to‐medium opportunity for skill use and task variety, whereas anxiety‐contentment is more a function of workload or uncertainty.