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SL54TH Temperature And Relative Humidity Data Logger

SL54TH Temperature & Humidity Data Logger

The SL54TH and SL54TH-A are our lowest cost temperature and relative humidity data loggers. They are self contained and self powered with the ability to record up to 8,000 data points. The SL54TH can operate in a temperature range of -20°C to +85°C and up to 100%RH.

  • Lowest Cost Temperature And Humidity Solution
  • Small Physical Size
  • 2 Year Battery Life
  • TempIT Compatible




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The SL54TH is our lowest cost temperature and relative humidity data logger. It is self contained and self powered with the ability to record up to 8,000 data points. The SL54TH can operate in a temperature range of -20°C to +85°C and up to 100%RH with an accuray of ±0.5°C and ±5% relative humidity. The SL54TH-A has an improved relative humidity accuracy of ±2% and an imporvoed temperature accuracy of ±0.1°C. The SL54TH-A is supplied with a UKAS traceable calibration certificate.

They are very small (about the same size as a watch battery) which enables them to be inserted into small items and packages.

The SL50R Button Reader™ interfaces to the USB port of a PC and is totally compatible with the user friendly, TempIT-LITE operating software which enables the logger to be set up and the data read and displayed in graphical format. Data can be stored and retrieved at a later time. The software can be up-graded to TempIT-PRO which provides various additional features such as data table view, export data to spreadsheet, email graphs and automated MKT Calculations etc. The TempIT software also automatically calculates dew point from the measured temperature and relative humidity readings.
The SL54TH and SL54TH-A also calculate dew point and absolute humidity.

SL54TH Starter Kits Are AvailableStarter kits with either two or five SL54TH or SL54TH-A temperature and relative humidity data loggers, the USB interface lead and a single computer licence of the TempIT-PRO software are available from the drop-down menu shown just below the price above.

Please call our sales office on 01684 299 399 for more information.

Power Internal Battery
Battery Life Typically two years at +30°C with a 10 minute sample rate
See detailed battery life calculator for more information
Measuring Range

-20°C to +85°C (-4°F to +185°F)
0 to 100%RH (0 to 90% continous, 90% to 100% for short periods)


±0.5°C from -10°C to +70°C for the SL54TH
±0.1°C from 0°C to +50°C for the SL54TH-A

±5%RH for the SL54TH
±2%RH for the SL54TH-A

0.5°C in low resolution mode
0.07°C in high resolution mode

Sample Rate 2 seconds to 24 hours

2 seconds to 1 minute in 5 second steps
1 minute to 1 hour in 1 minute steps
1 hour to 24 hours in 1 hour steps
Number of Readings Stored 8192 in low resolution mode
4096 in high resolution mode
Reusable When Memory Full Yes
Response Time
Response times in moving air:
63% time constant
Temperature: 1 Min 29 Seconds
Relative Humidity: 3 Min 44 Seconds

10-90 % time constant
Temperature: 2 Min 50 Seconds
Relative Humidity: 9 Min 54 Seconds
Waterproofing Due to the vent required to allow humidity measurement, this device is not considered waterproof and care should be taken to avoid moisture ingress.
Delayed Start Yes, you can specify a time and date to start logging up to 1 year in advance with one minute resolution
Software Alarms Yes, high and low alarms can be specified in the software
Intrinsic Safety Meets UL#913 (4th Edit.); Intrinsically Safe Apparatus, approval under Entity Concept for use in Class I, Division 1, Group A, B, C, and D Locations
Material 305 Stainless Steel
Dimensions 17mm diameter x 6mm high
Warranty 1 Year
IATA 2017 Compliant

Yes, exempt from the regulations

Can be sent on airlines without declaration