Instrument: Sea-Bird SBE 56 temperature recorder

This is a small (30 cm by 2.54 cm diameter) high-accuracy, battery-powered temperature and time logger capable of sampling intervals from 0.5 seconds to 9 hours. Temperature is measured by a pressure-protected (1500m depth) thermistor. Initial accuracy is 0.002C and drift is typically less than 0.002C per year.