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The Ann Arbor District Library has one of these available for checkout, so that's the one I'm reviewing. Simple enough to use even without a manual, durable construction. The screw mount is handy. Can't comment on calibration or accuracy, but I'm mostly using it for rough estimates of relative intensity and not precisely calibrated ere was actually some sunlight in Michigan in February so I took it outdoors to obtain a reading just to prove it. I'd think this might be a more interesting device for outdoor use in the summertime.