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Easiest to Comply with ASTM F2170
Competitive RH methods use sensors that must be calibrated and/or verified for calibration. However, you never have to recalibrate or verify calibration of Wagner's Rapid RH sensors; here are the facts:

Section 8 of ASTM F2170-2, 'Standard Test Method for Determining Relative Humidity in Concrete Floor Slabs using in situ Probes' is very clear about the need to verify the calibration of re-usable probes within 30 days of usage. This applies to ALL re-usable RH probes. Since the Wagner Rapid RHâ„¢ Smart Sensor is not taken in and out of the hole, unnecessarily handled, exposed to adverse conditions and then re-used, this requirement does not apply to the superior design of the patented Wagner Rapid RHâ„¢ method. For other competitive methods, the procedures for checking calibration are time consuming, tedious and require using either a salt solution or a humidity chamber of some type.

The alternatives for anyone using the other RH testing methods that utilize external, reusable probes is to have the probes recalibrated (expensive) or verified for calibration at the manufacturer or attempt to perform calibration verification (un-certified) on their own. Actual recalibrating by an end-user is a very poor option. Often, the only realistic option for an end-user of the competitive methods is just to purchase new, relatively expensive probes.

Additionally, if a flooring failure occurs, and your RH readings for the slab have been called into question, you don't need the additional hassle of trying to explain why your reusable probe calibration had not been recently verified according ASTM F2170-02. The very nature of the Rapid RHâ„¢ design and method with certifiably-calibrated (NIST) stay-in-place probes means that calibration concerns, traceability and the associated certified documentation is not left up to the flooring contractor, general contractor, Architect/Engineer or Independent Testing company.

With the Wagner Rapid RHâ„¢ method, you get accuracy and peace-of-mind with no recalibration and no hassle.