Extech 42542 High Temperature IR ThermometerExtech 42542 High Temperature IR Thermometer 30: 1 Wide range InfraRed Thermometer with laser pointer Wide temperature range: 58 to 1832F ( 50 to 1000C) High 30 to 1 distance to target ratio measures smaller surface areas at greater distances High and low alarms Adjustable emissivity increases measurement accuracy for different surfaces Adjustable High Low setpoints with audible alarm Min Max Avg plus differential between Max Min High resolution of 0.