Records output of sensors requiring preheating such as water level sensors and agronomic sensors. Combining with the 3631-20 Temperature Logger, the 3639-20 Pulse Logger or the 3640-20 Lux Logger enables the easy creation of agricultural and civil engineering related databases with this compact logger series.

A variety of credit card-size compact loggers feature multiple types of instrumentation (including as a voltage logger with preheating) and enables recording of temperature and humidity, various types of current, voltage pulses, and illumination levels. These powerful handy devices allow recording of large volumes of data (16,000 or Option 3911 Communication Base 32,000 data points), provide recording intervals that can be set in 15 steps from 1 second to 60 minutes, and provide data backup to protect against data loss when batteries are exhausted or being replaced. Get the benefits of ease-of-use and reliability, both in a compact package.