Reads relative humidity RH, air temperature TA, dew point, wet bulb globe temperature WBGT and black globe temperature TG. Also captures sample time and date. Records data onto standard SD Secure Digital memory cards like a digital camera. When full, simply exchange SD cards for unlimited data storage. The removable SD card is easy to transport and insert into a computer’s memory card slot or SD card reader. Uploads pre-formatted data to Excel, without the need for additional software and cables. Additional SD cards are readily available in a variety of memory sizes. Features an adjustable WBGT audible alarm, min/max, auto power-off, low battery indicator and hold function. Comes ready to use in a soft carrying case with 6 AA batteries, instruction manual, and an SD card. Uses optional USB Power Cable #840058, or AC Adapter #840097. N.I.S.T. traceable Certification Report is available for RH & Air Temperature only.Globe diameter: 23⁄4 70 mmDimensions: 103⁄4 × 21⁄2 × 13⁄4 273 × 64 × 44 mmWeight: 1 lb. 0.45 kg *Certification Option N.I.S.T. traceable Certificate of Compliance available at additional cost Select option above. Specifications .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; overflow:hidden;padding:6px 2px;word-break:normal;} .tg th{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; font-weight:normal;overflow:hidden;padding:6px 2px;word-break:normal;} .tg .tg-z9od{font-size:12px;text-align:left;vertical-align:top} Range Resolution Accuracy WBGT Indoor / Outdoor:@95%RH -10 to 52 degrees C@0% RH -10 to 34 degrees C@95% RH 14 to 126 degrees F0% RH 14 to 93 degrees F 0.1 Indoor:±1 degrees C 15 to 59 degrees C ±1.5 degrees C Others±1.8 degrees F 59 to 138 degrees F ±2.7 degrees F Others Outdoor:±1.5 degrees C 15 to 56 degrees C ±2 degrees C Others±2.7 degrees F 59 to 132 degrees F ±3.6 degrees F Others Air Temperature -0 to 50 degrees C32 to 122 degrees F @15 to 40 degrees C±0.8 degrees C± 1.5 degrees F Globe Temperature -10 to 65 degrees C14 to 149 degrees F @15 to 40 degrees C±0.6 degrees C± 1.1 degrees F RH 5 to 95% RH ≥ 70% RH: ± 3% rdg + 1% RH,