The Abbeon AB 167 Certified and Calibrated Hygrometer Humidity Indicator by Lufft is a certified accurate hygrometer. The hygrometer has been tested at three positions of the dial at temperatures from 32° to 230°F, certified to be accurate within ±3% RH. Includes conformity information. CALIBRATED UNIT (to NIST Standard) WITH CALIBRATION CERTIFICATE. The hygrometer utilizes the Lufft Durotherm element, a synthetic hygroscopic fiber that expands and contracts in response to the moisture in the air. 6" Polished Brass Case, 5" Dial. Normally Ships in 3-5 business days. MSRP: $287.00.

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