Product
Thermologger
The Thermologger is a compact, autonomous temperature datalogger for long-term outdoor air-temperature monitoring. It runs on its own with no external power or wiring and stores every reading internally.
Technical specification
- Size
- 68 x 22 x 22 mm
- Weight
- 48 g
- Battery
- Sealed lithium - more than 10 years in any conditions, and about 15 years in mild ones (around 20 °C), because warmth drains a battery faster and cold slows the discharge. Cell chemistry guaranteed for 10 years by the battery manufacturer.
- Memory
- 507 872 records (about 14 years in Basic mode, one reading every 15 minutes)
- Connector
- Touch probe for settings and download via TMD Adapter
- Temperature sensor
- MAXIM/DALLAS DS7505U+
- Resolution
- 0.0625 °C
- Accuracy
- ± 0.5 °C
- Measurement range
- -40 to +60 °C(Can measure up to -60 to +85 °C, but extreme temperatures can shorten battery life)
Why choose the Thermologger?
Standalone, rugged, long-term measurements
- Works independently without external hardware; keeps logging even if moved by animals or wind.
- Autonomous logging with long battery life and large memory.
Precise and reliable data
- Temperature measured with a digital DS7505 sensor - accuracy ± 0.5 °C, resolution 0.0625 °C.
- Data extraction is quick using the TMD Adapter and Lolly Software.
- Pair it with a Sun Shield to keep direct sunlight off the sensor for a true air-temperature reading.
Field-proven in research and deployments
Thermologgers and other TOMST dataloggers are used worldwide - from forests and mountains to wetlands, deserts, and agricultural landscapes - for microclimate and air-temperature monitoring. Their data feeds community-maintained datasets used for climate, drought, and model-validation research.
Easy data handling, low cost
- Lolly Software lets you download, visualize, export, and reconfigure measurement intervals.
- Lower cost than many commercial dataloggers, enabling large spatial or dense network deployments.
Typical use cases
- Long-term ambient temperature monitoring in ecology, climatology, hydrology, and soil science.
- Environmental monitoring in agriculture, forestry, and horticulture.
- Field research in remote, hard-to-reach, or extreme locations where traditional measurement equipment struggles to survive (e.g. polar regions).
Custom variants
The listed versions are what we keep as standard, but they are not the only thing we can build. Most of the range began exactly this way: the TMS, the Point Dendrometer and many of the variants exist because a research project needed something that did not exist yet. If your deployment needs something the standard range does not cover, write to us at tomst@tomst.com and we will discuss what is possible.