The Jerome J605 from Arizona Instrument uses gold film sensor technology to detect hydrogen sulfide gas at concentrations as low as 3 parts per billion. It has a survey mode to aid in pinpointing the source of a hydrogen sulfide gas leak. While in that mode, the instrument samples the air continuously, allowing the user to sweep an area for hydrogen sulfide hot spots, and enabling efficient corrective action to be taken. Its durable, all-metal housing makes it an ideal fit for difficult conditions, and an onboard data collection system records up to 20,000 data points for detailed recordkeeping and analysis. 800/528-7411; www.azic.com.