The sulfur will not indicate the level of hg exposure. If you borrow a Jerome meter and post the readings ,I can tell you your daily dose of hg vapor but be sure to note whether the readings are in micrograms ,nanograms or milligrams.Of course there is no way to calculate your hg exposure before you disposed of the thermometer. While you are at it, how about getting a reading on one of those hg filled compact fluorescent bulbs.