Measuring relative humidity, temperature, and wind speed right where the concrete is being placed can help prevent plastic shrinkage, and the Kestrel 4300 may be a solution. Accurate, quickresponse readings give concrete professionals the information they need to place concrete that won’t crack. The Kestrel’s 1800 data-point log can document that placement was done during appropriate conditions and information can be uploaded to a PC for long-term storage, in-depth analysis and detailed charting. Nielsen- Kellerman/Kestrel . 610-447-1555.