I'm interested in sourcing a device that can provide rapid, accurate and portable measurement of mercury at the ppb level. I saw the Ocean optics adverts, but after 3 emails asking for prices, I still haven't heard from them, so not sure what to make of that. Has anyone used these devices (QE-series spectrometers) or similar and what are your experiences and opinions? We're looking to do 800 sites, any other suggestions? Thanks in advance Rod Holden Managing Director Derwent Remediation Pty Ltd