The REED R4700SD is an SD-card data-logging version of REED's 6-in-1 environmental meter, covering air velocity, air/ambient temperature, humidity, light and contact temperature with a backlit LCD for low-light readouts. Logging runs automatically at operator-set intervals from 1 to 3,600 seconds (or up to 99 manual points) and exports straight to Excel from the card without extra software; data hold and min/max are also built in. An optional adapter can turn it into an IEC 61672 class-2 sound level meter, and it accepts an optional tripod/AC adapter for unattended long-term monitoring. This item ships with an add-on NIST-traceable calibration certificate.