Raytek Raynger 3i Plus Infrared Thermometer

June 23, 2015

The Raynger 3i Plus Series infrared thermometer is designed in accordance with industry standards to meet process performance requirements in hot environments of 400 to 3,000°C (752 to 5,432°F) and provides exceptional accuracy.


The portable thermometer is ideal for use in high-temperature industrial applications such as iron & steel, metal refining, foundry & processing operations, ceramics, semiconductors, and chemical & petrochemical furnaces, as well as heat treatment and power plants. The series offers a number of advanced features to optimize performance with high accuracy (±0.5% +1°C), such as high optical resolution, faster exposure/processing time, and a large memory capacity.


The Raynger 3i Plus Series models 1M and 2M meet a wide range of process temperature detection and fault previewing requirements. Their enhanced ease-of-use features include an intuitive user interface for easy parameter setup, ergonomically designed comfort grip, accurate targeting when high-temperature targets are not visible using laser sighting alone, and rechargeable Lithium-ion batteries for longer operational cycles of 24 hours. In addition, the 3i Plus features fast and easy transfer of data to a PC or smartphone via USB or Bluetooth, a mobile application for quick data transfer and collaboration, and can be used as a temporary online thermometer


Each 3i Plus thermometer includes Raytek DataTemp Windows PC software, which supports real-time communication, data storage, graphing, and analysis; Lithium-ion battery; carrying case; mini USB port adapter; mini USB-to-jack converter for charging battery separately; and operators manual.

  • Laser temperature gun temperature range: 400 to 3,000ºC (752 to 5,432ºF)
  • Flexible for a wide range of applications/temperatures
  • Rugged design reduces the risk of damage (withstands 1 m (3.2 ft) drop)
  • Dual laser and scope sighting options for fast and simple target aiming
  • Red Dot sighting technology for accurate targeting against “red hot” backgrounds
  • "Red Nose" heat-resistant warning detector and alarm
  • High optical resolution ensures accurate temperature readings at longer distances
  • Ambient operating temperatures: 0 to 50ºC (32 to 120ºF)
Model/Spectral ResponseTemp. RangeOptical ResolutionApplications
1M (1 µm)
700 to 3,000°C
(1,292 to 5,432°F)
Iron, steel, metal refining,
foundry, ceramics,
chemical & petrochemical furnaces
2M (1.6 µm)
400 to 2,000°C
(752°F to 3,632°F)