1Backlight dual display of humidity and temperature. 2Measures dew point and wet bulb temperatures. 399 record storage capacity, ergonomic design with protective holster. 4Quick response capacitance sensor with twist-open protective cover. 5Min. / Max, data hold and low battery indicator function. Features: 1. Backlight dual display of humidity and temperature. 2. Measures dew point and wet bulb temperatures. 3. 99 record storage capacity,ergonomic design with protective holster. 4. Quick response capacitance sensor with twist-open protective cover. 5. Min. / Max,data hold and low battery indicatorfunction. 6. It has automatic shutdown function. 7. It can display three type of temperature, ambient temperature dew-point temperature wet bulb temperature. Specification: Condition: 100% Model: PM6508 Ambient Temperature Range: -20-60C (-4 to 140F) Precision: 1.0C (0 to 45C) 1.5C(-20 to 0C,45 to 60C) Resolution: 0.1C/F Update Rate: 400ms RH Range: 0-100%RH Accuracy : 3.0% RH(20% to 80%) 4.0% RH(0% to 20%,80% to 100%) Resolution: 0.1% Wet Bulb Temperature Range: -20 to 60C (-4 to 140F) Precision : 1C (0 to 45C) 1.5C(-20 to 0C,45 to 60C)Resolution: 0.1C/FDew-point Temperature Range: -50 to 60C (-58 to 140F)precision : 1C (0 to 45C) 1.5C(-50 to 0C,45 to 60C) Resolution: 0.1C/F Update Rate: 400ms Number of Storage: 99 Power Supply: 4* AAA dry Batteries, 24A, LR03 (not included) Battery life: 200 hours Weight: Approx. 261g / 9.2oz Size: Approx. 184 * 60 * 29mm / 7.2 * 2.4 * 1.1in Package List: 1 * PM6508 Digital Humidity and Temperature Meter 1 * Bag