Soldering iron thermometer xytronic 191 the xytronic 191 soldering iron thermometer is ideal for fast and accurate checking of soldering iron tip temperature and for calibrating variable temperature soldering stationsequipped with a number of superb features such as the large easy to read digital display along with the low battery and sensor burn out indicators this well designed thermometer is a clear leader in its field offering outstanding value xytronic 191 soldering iron therm