Therm-A-Lert WIRELESS Temperature & Humidity Loggers


Wireless two-way communication
Accuracy to ±0.2°F (Therm-A-lert-P)
Real-time text alerts to cell phone
Auto data archiving for continuous use
400 feet line of sight distance
2 year battery life
Optional repeaters extend range


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For wireless monitoring of critical temperature and humidity data, the LogMaster Therm-A-lert will do the job. Ideal for pharmaceutical and medical storage with auto data downloading and archiving so you'll always have your important data saved.

With its two-way communication, data can be retrieved and settings can be sent to each logger without removing from its location saving time and staff resources. Measure ambient temperature and humidity, or choose the Therm-A-lert with attached external RTD probe for higher temperatures and accuracy. Optional glycol vials are available for use with the external RTD probe for cold storage of immunization and medical products.

With real-time wireless data transmission, text alerts to cell phones and emails can be set up for timely arrival. LogMaster software also allows for dashboard views, full statistical analysis, exporting, calibration trim adjustments, and supports multiple languages.

Temp Range
-4 to 176°F (-20 to 80°C)
-4 to 176°F (-20 to 80°C)
Probe Range
-328 to 500°F (-200 to 260°C)
Probe Dimensions
3 inch RTD probe with a 3 foot lead wire
Humidity Range
0% to 95% RH
±0.9°F (±0.5°C) from 32 to 122°F (0°C to 50°C)
±0.9°F (±0.5°C) from 32 to 122°F (0°C to 50°C)
±3.0% RH (±2% RH typical at 77°F/25°C)
±0.2°F (±0.1°C) from -4 to 176°F (-20°C to 80°C)
Wireless Range
Line-of-sight 400 feet, indoors 150 feet
RF Frequency
2.45GHz IEEE 802.15.4
Operating Environment
-4 to 176°F (-20 to 80°C), 0% to 95% RH non-condensing
-4 to 176°F (-20 to 80°C), 0% to 95% RH non-condensing
-4 to 176°F (-20 to 80°C), 0% to 95% RH non-condensing
30,000 readings
15,000 readings per channel
30,000 readings
3.6V lithium battery included; user replaceable, 2 years typical
5.25 H x 2.2 W x 1.3 D inches (133 H x 55 W x 33 D mm)

LogMaster Software Quick Specs
• Real time recording via Serial, USB or Wireless
• Real time alarm notification
• Send email or phone text for alarms
• Real time auto save to text file
• Multiple graph overlay for profiling
• Display multiple engineering units
• Data summary statistics
• Digital calibration of loggers
• Data recall and export
• Customizable graphs
• Quick links to start and stop logging
Free Software Download
Select example data from the File menu and enter the model number you want to see.
IR Holster

Glycol Bottle

Model: TW-3120-GB

  • 120ml
  • Includes lid and probe penetration cap
120ml glycol bottle with lid and probe penetration cap


Wireless RF Transceiver / Repeater

Model: RFC1000

  • USB to mini USB adaptor
  • AC Power supply included
  • Use as access point or repeater
RFC1000 required to log readings to PC. Includes USB cable and software. 7-inch pivoting antenna.


Wall Mount Bracket

Model: WM-100

  • Wall Mount bracket for Therm-A-Lert
  • Wall fasteners included
Wall Mount bracket for Therm-A-Lert


Replacement Battery

Model: TLH-5903

  • High Energy Lithium battery for Therm-A-Lert and RFOT loggers
  • 3.6V AA
Replacement battery for Therm-A-Lert and RFOT data loggers

Cal Cert

NIST-Traceable Temperature Calibration

Model: CAL-2PT

  • 2-Point calibration
  • Traceable certificate
2-point temperature calibration performed in ThermoWorks' NIST-Traceable calibration lab. Includes calibration report and actual test data.
(Please allow 1-2 weeks for cal lab processing)

Cal Cert

NIST-Traceable RH Calibration

Model: CAL-RH2PT

  • 2-Points: 30%, 60%
  • Lab calibration using certified RH sources
  • Single ambient temperature
2-point humidity calibration performed in ThermoWork's NIST-Traceable calibration lab. Includes calibration report and actual test data. Includes a single temp at ambient.
(Please allow 1-2 weeks for cal lab processing)

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