Designed to operate in environments ranging from 400–3,000°C while providing accuracy of ±0.5% +1°C, Raynger® 3i Plus Series is suited for metal refining, foundry and processing operations, chemical and petrochemical furnaces, heat treatment, and power plants. Units are housed in rugged casing with Red Nose heat-resistant warning detector and alarm to minimize risk of sensor overheating. Powered by Lithium-ion batteries, thermometers transfer data to PC or smartphone via USB or Bluetooth.