Temperature & Humidity Data Logger with Digital Display

This product has been replaced by the TM320

Our TM121 has been completely redesigned and now goes by TM320.

Click on the link to view and order the NEW TM320 Data Logger.

TM320

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Dickson Expert Services

Our Dickson Data Division has specially trained representatives to address the needs of customers with large installations or unique demands. Please call 888-452-4626.

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Description 12-Pack Coin Sized Temperature & Humidity Loggers Compact Temperature & Humidity Data Logger Compact Temperature & Humidity Logger with Display, Start/Stop
Price $999.00 $199.00 $249.00
Battery Operation Icon-compare-check Icon-compare-check Icon-compare-check
Temperature Range Icon-question
  • -4 to 158F
    (-20 to 70C)
  • -10 to 176F
    (-23 to 80C)
  • -4 to 158F
    (-20 to 70C)
Temperature Accuracy
  • ±1.8F from -4 to 158F
    (±1C from -20 to 70C)
  • ±0.8F from 20 to 120F 1.8F Remaining
    (±0.44C from -7 to 49C 1C Remaining)
  • ±0.8F from 20 to 120F 1.8F Remaining
    (±0.44C from -6 to 48C 1C Remaining)
Humidity Range
  • 0-95% RH non-condensing
  • 0-95% RH non-condensing
  • 0-95% RH non-condensing
Humidity Accuracy
  • ±2% RH from 0 to 60%
  • ±3% RH from 60 to 95%
  • ±2% RH from 0 to 60%
  • ±3% RH from 60 to 95%
  • ±2% RH from 0 to 60%
  • ±3% RH from 60 to 95%
Compare Compare Compare
Add to Cart Add to Cart Add to Cart
  • Humidity Accuracy +/-2% RH from 0 to 60% RH; +/-3% RH from 60 to 95% RH
For more information on this product and other Display Data Loggers products see the Display Data Loggers page.

Why won't the unit turn on when the button is pressed?

  • Data Logger may be "locked up", try removing the battery and then replacing after a few moments.
  • Battery is dead, try replacing.
  • Does the unit come on when attempting to communicate with the software? The keypad could be unplugged or defective.

Why won't the data logger communicate with my PC?

  • Is the Data Logger functioning otherwise? Make sure battery is good.
  • Is the correct version of software being used?
    Minimum requirements listed below: SM101, SM125, TM121 & TM125 -
    DW99 3.0.1.1 or higher SM150 -------------------------------DW99 5.0.1.4 or higher
  • Make sure the download cable is not physically defective.
  • Is the correct COM port selected?
  • Try another available COM port through the software.
  • Has the communication speed (baud rate) been changed? It should be set on ADAPTIVE.
  • Check Com port allocations in the PC's Device Manager, make sure the COM port you're trying to use is not "reserved" for something else.
  • Try another logger. (if available)
  • Try another available COM port connection on back of PC.
  • If this is the first time attempting to communicate on this PC, or if new software or programs have been installed since the logger was last used, try installing the software on another PC.
    (not a laptop)

Why didn't my Data Logger download all of the stored data?

  • Has the unit just been removed from a cool environment? Condensation may have momentarily formed internally, wait for the unit to warm up, it should power up and give all data stored.
  • Is it possible that the logger was programmed to fill up storage space quicker than originally thought?
  • Is the logger set up to WRAP as opposed to STOP when full?

Why won't the display respond to changes?

  • Unit may be "locked up", try removing the battery and unplug the adapter, if applicable, then replace the battery after a few moments.

Why won't the display stay on?

  • The display only stays on momentarily unless you're using an AC adapter, or if the unit is put into continuous mode by pressing the ON and F/C buttons at the same time. The display will show
    cont in the lower left hand corner of the display when in continuous mode.
  • If using an AC adapter, it may be defective.

Why doesn't the unit have Power?

  • Has the Data Logger just been removed from a cool environment? Condensation may have momentarily formed internally, wait for the unit to warm up, it should power up and give all data stored.

Why doesn't the Battery Back-up work?

Is there a battery in the unit?

Is the battery good?

Is the battery in correctly?

If the power outage was only momentary, the unit may not have had enough time to recognize this and switch to battery mode (The unit may lock-up or shut off in this situation)