Data loggers: the way to monitor a freezer or cooler's temperature

Data loggers are devices that can be used to sample and store
temperature and/or humidity at regular intervals. Before data
logger chart recorders used paper charts to record the
information, but modern data loggers store the information in
RAM memory until they can be downloaded to a computer.

Data loggers were originally created as weather forecasting
tools, but were quickly adopted as a perfect way to monitor
freezers or coolers. Keeping stable temperature in a freezer is
much more important than most people think. It is especially
true when deep frozen food is stored where a ten degrees can
make the difference between safely stored food and food which
can promote bacteria growth. The 10-degree difference in
temperature might seem small, but it is crucial for deep frozen
products. 

Data loggers are absolutely necessary in professional freezers.
The standard thermometer inside the freezer shows only the
present temperature. Data loggers can check for temperature
fluctuations when no one was looking; 24/7/365.

There is at least one problem with data loggers that limit their
usefulness. They need a computer to see what they recorded.
There is no way to see what the temperature history unless the
information is downloaded to a computer where it can be
displayed on the screen. Fortunately there is a data logger that
overcomes this problem: ThermaViewer.

ThermaViewer

Unlike other data loggers, ThermaViewer works all by itself. It
has a processor, its own memory and a big LCD screen, it doesn't
need any other device to display all the data it gathers. Its
two sensors can be placed up to 100 feet from one the display
unit, which allows it to monitor and document temperature even
in large freezers. As everything is stored in ThermaViewer
internal memory and is displayed on the LCD screen, this is the
only one of all data loggers that the user can get immediate
results from. A temperature chart is drawn on the LCD display so
that anyone can immediately tell what has occurred within the
last day, week or even month.