Since we introduced the worlds first truly handheld dry-well, many have tried to duplicate it in vain. Despite its small size and light weight, the 9100 outperforms any dry-well in its class in the world. Its simple and convenient too. Anyone can learn to use one in less than 15 minutes. It has a range to 375 degrees C (707 degrees F) and is perfect for checking RTDs, thermocouples, and small bimetal thermometers in the field.