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I have a handheld SQM-L for personal use, the "L"ens is said to result in a slightly more focused measuring cone, making measurements more meaningful in real-life circumstances. Measurements are quite repeatable so I guess it's reasonably accurate. Zenith is where you usually measure, yes, but you don't have to if the area you're interested in is not at zenith. At the club, we have the computer controlled version of the SQM-L (I've forgotten the exact name), which makes time series and even car-mounted surveys etc a lot easier. The SQMs are able to be calibrated, instructions are on the Unihedron website.
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