The Jerome J605 gold film hydrogen sulfide analyzer from Arizona Instrument detects hydrogen sulfide gas at concentrations as low as 3 parts per billion, with a resolution of 20 parts per trillion. It has onboard data logging that can store up to 20,000 measurements for detailed recordkeeping and analysis, as well as a USB interface for data transfer and SCADA interface capabilities. It has a solid-state design, durable metal casing and 24-hour battery life. 800/528-4711; www.azic.com.