Onset Computer Corp., a supplier of battery-powered data loggers, is offering a free guide, entitled “Choosing a Water Level Logger: 5 Things You Should Know.” The guide, which was compiled from experienced user feedback and industry resources, provides water professionals with tips on how to evaluate specific water level data loggers, and points out key factors to consider during the product selection process. The free guide is available from Onset, and can be obtained at www.onsetcomp.com/guides or by calling 1-800-LOGGERS. Onset Computer Corp., Card No. 288