Alex, I used hobo brand data loggers to record air and soil temps, light intensity, and relative humidity. The model data loggers that I used were not waterproof, so I attached the loggers to 3 foot wooden post with Velcro and attached the lower half of a gallon milk jug over top of the logger to serve as a rain shield. I used the same loggers for a four year period and had no major problems. With this style of data logger, I had to replace the batteries each year. Also, this model of data logger requires an additional cord to record soil temps. One problem I had was small mammals chewing on the cords. So, I ran the cord through a piece of PVC pipe and then inserted the probe in the ground. I can send some pics of my setup if it would help.
Good luck, Bill Sent from my iPhone On Aug 17, 2012, at 3:27 PM, Alex Wolf <[email protected]> wrote: > Hello all, > > We are conducting a long-term study examining effects of forestry practices > on herpetofauna and would like to record temperature and humidity, ideally in > the leaf litter, at our trapping sites. We would need at least 12 > concurrently recording devices, either continuous data loggers or > thermohygrometers with a min/max memory function, and need to keep costs down > as much as possible. Anyone know of any economic options available? The > best options I have found thus far are humidity sensing iButtons (~$96) or > pen-style thermohygrometers (starting ~$30), though I have concerns that the > latter would not survive field conditions very long. Any suggestions would > be appreciated! Thanks! > > Alex Wolf > Resource Staff Scientist > Missouri Department of Conservation > [email protected]
