New Pac 3000 and Pac 5000 single-gas detectors from Draeger Safety monitor the air and alert the user to dangerous concentrations of carbon monoxide or H2S, and low oxygen levels. Once activated, these small, lightweight monitors operate for two years without replacing or calibrating the sensors. The new instruments feature simple, two-button operation, an infrared interface, and three alarm modes. During an alarm or at the push of a button, each unit’s display becomes backlit.