Choosing appropriate saturated salts for regulating incubator relative humidity for maintaining adult workers in the laboratory

A variety of salts can produce a wide range of relative humidities at many defined temperatures (see Table 1 in Winston and Bates (1960)). Choice of these salts should be determined by desired relative humidity and temperature conditions. Sodium chloride (NaCl) is easily available and can maintain relative humidity at ~75% over various temperatures when certain criteria are met (section Sodium chloride can still be used despite circumstances when all criteria are not met, especially when an open basin of water alone cannot regulate the desired conditions; however, constant vigilance of relative humidity is required (section 6.3.3).