Fluke 66 FE 63-66-68 Users Manual - Page 19

63/66/68 Operating the Thermometer Table 2. Surface Emissivity (cont.) Measured Surface Emissivity Measured Surface Emissivity Steel Cold-Rolled Ground Sheet Polished Sheet Zinc Oxidized NON-METALS Asbestos Asphalt Basalt Carbon Unoxidized Graphite Carborundum Ceramic 0.7-0.9 0.4-0.6 0.1 0.1 0.95 0.95 0.7 0.8-0.9 0.7-0.8 0.9 0.95 Clay 0.95 Concrete 0.95 Cloth 0.95 Glass Plate 0.85 Gravel 0.95 Gypsum 0.8-0.95 Ice 0.98 Limestone 0.98 Paper (any color) 0.95 Plastic Opaque 0.95 Soil 0.9-0.98 Water 0.93 Wood, (natural) 0.9-0.95 Switching °C and °F Open the unit by pushing the button on the underside of the thermometer near the trigger and pulling down and forward at the top of the handle. To toggle between °C and °F, slide the top switch to the appropriate position. See Figure 2. Trigger Lock (66/68) To lock the unit on for continuous measurement, slide the bottom switch down. See Figure 2. If the trigger is pulled while the unit is locked on, the laser and backlight will turn on if they have been activated. When the unit is locked on, the laser will turn off when 15