Deuteron’s loggers cannot be used with all MicroSD cards, but rather are limited to cards that have been tested and demonstrated to work well with the loggers. A card can be unsuitable if it consumes too much current, thereby unreasonably reducing battery life, or if it takes too long to accept and write data within the logger. At present Deuteron recommends using only Sandisk Extreme Pro MicroSD cards of size 32GB or 64GB. Users who wish to buy MicroSD cards from the recommended list themselves will need to format the memory cards according to the intructions in the user manual for preparing the memory cards for first use. The first stage is to format the cards using a format which generally differs from the format of the cards as supplied by the manufacturer. A free utility for doing so is FAT32Format from Softonic. To download it, click here