The DSP1000 provides fast, accurate measurements for analysis of critical environmental conditions. Temperature, Humidity. Wet Bulb Temperature, Dewpoint Temperature, Fast Response, Dual Display, Max Hold, Data Hold Function, No Twirling, No Reading Charts, No Water Necessary. Auto Power Off (Disable Sleep Mode). Backlight, Measures 1.77" width by 8-55/64" height by 1-49/64" depth; 1 year warranty. Applications: Cellophane, Chemical, Laboratory, Pharmaceuticals, Textile, Paper, Photographic, Printing, Snowmaking, Tobacco, Indoor Air Quality, Wine Storage, Floral, Meat. Humidity Range: 0-100 percent RH (Non-Condensing). Temperature Range: -22 degree F to 212 degree F (-30 degree C to 100 degree C). Dewpoint Temperature Range: -22 degree F to 212 degree F (-30 degree C to 100 degree C). Wet Bulb Temperature Range: 32 degree F to 176 degree F (0 degree C to 80 degree C). Humidity Accuracy: +/-2 percent RH (20 percent RH to 80 percent RH), +/-2.5 percent RH (all other ranges). Temperature Accuracy: +/-0.9 degree F/+/-0.5 degree C (at 77 degree F/25 degree C), +/-1.5 degree F/+/-0.8 degree C (all other ranges). Resolution: 0.01 percent RH, 0.01 degree F/0.01 degree C. Response Time: 10s (90 percent at +77 degree F (+25 degree C) still air). Battery Type: 9V Battery NEDA 1604, IEC 6F22 (included). Operation Temperature: 32 degree F to 104 degree F/0 degree C to 40 degree C (