Casio TS-1000 | Liquid Crystal,First wristwatch with a built-in thermometer The TS-1000 could tell the temperature, another first for a wristwatch. It employed a fine ceramic semiconductor called a thermistor to sense changes in temperature. The,CASIO TS-1000 THERMOMETER DIGITAL WATCH RARE VINTAGE 1982 NEVER WORN | WatchCharts Marketplace,Casio TS-1000,Casio TS-1000