Dear Lab Guy,
You have a great question about two of my favorite products! I have at least six of these Data Loggers measuring freezers and desiccators around my office. I can check the temperature of any and all of them by simply opening the app on my phone. Both take and log Temperature and Humidity readings.
For B61506-5100 all you have to do is place the unit into or on whatever you want to measure. This unit is great on a bench, in a desiccator, or other dry, less extreme environments. Refrigerators, freezers, and incubators may damage the internal electronics of the unit which could inhibit or completely halt the signal transmission. It’s not impossible to put this device into these appliances, but you may need to clean and dry it out frequently.
For B61011-5100 you can measure the same way as its blue counterpart, as well as taking another temperature reading from wherever the bottle (filled with glass beads) is placed. This probe will only measure the temperature, not humidity, but this bottled-probe is ideal for freezers, and especially the deep-freeze (down to -50℃).
The bottle/probe retains the ambient temperature even when the doors of the appliance are opened and closed, fluctuating the internal temperature. This makes the verification data logger (B61011-5100) the best choice for un-interrupted temperature readings from refrigerators, freezers and incubators, even when they may experience frequent opening and closing.
NOTE: These thermometers are battery-run electronic devices, so you need to consider ‘where’ you end up placing them.
I hope this helped and answered your question. Thanks for writing in, and please feel free to write back if I can help in any other way.
Yours in science, Lab Guy