TidbiT v2 Water Temperature Data Logger, provides 12-bit resolution and has +/- 0.2 Deg C accuracy, Onset's smallest temperature data logger, Waterproof to 300 meters (1,000 feet), designed for outdoor and underwater environments
HOBO* Pro v2 External Temperature Data Logger, weatherproof data logger with an external soil/water temperature sensor on a 6-foot cable useful for situations where just one temperature probe is required, internal temperature sensor is also included
HOBO* 4-Channel Analog Data Logger, high-performance, LCD display data logger for building performance monitoring applications, flexible support up to four external sensors for measuring temperature, current, CO2, voltage, Twice the accuracy with 16-bit resolution
Number, Measurement and Space, module establishes equivalence of sets by a one-to-one exchange of objects. Eg Upsetting equivalance (destroying conservation of numbers) by adding one object to a set, or taking one away, helps introduce vocabulary for comparing quantity