TR-51AS Temperature Recorder data logger is compact, water resistant one channel temperature logger.
Temperature Range: -40 to +80 °C, Resolution: 0.1 °C
TR-52AS Temperature Recorder data logger is compact, water resistant one channel temperature logger.
Temperature Range: -60 to +155 °C, Resolution: 0.1 °C External probe.
TR-51AS or TR-52AS Temperature Data Loggers can be used on both normal outdoor conditions and in harsh environments such as underground, in snow and frozen conditions as well as in environments where temperature varies greatly.
TR-51AS and TR-52AS  Temperature Loggers are outfitted with internal sensor and a water resistant rating for temporary immersion.

• Temperature Range: -40 to +80 °C or
  -60 to +155 °C

• Resolution: 0.1 °C

• Accuracy: Avg. ±0.5 °C

• Compact / Lightweight / Water Resistant

• Wide Temperature Measuring
  Range -60°C to 155°C

• Large Data Capacity: up to 16,000 Readings

• Wide Selection of Recording Intervals

• Two Recording Methods

Compact / Lightweight / Water Resistant
The lightweight yet durable water resistant construction allows you to use this unit under the harshest of conditions. It can be reliably used in high condensation areas, refrigerated and frozen environments as well as underground.
Note: The waterproofing is sufficient for most situations, but is not for continued immersion.
Wide Temperature Measuring Range -60°C to 155°C
The TR-51A with its internal sensor can measure and record from -40°C to 80°C and theTR-52 model with its standard external sensor can measure and record from -60°C to 155°C.
Large Data Capacity: up to 16,000 Readings
With one unit you can record up to 16,000 readings. If set at a one hour recording interval that gives you 666 days or almost two years of readings
Wide Selection of Recording Intervals Two Recording Methods
The TR-51A gives you eight recording intervals (1 minute-1 hour) to choose from, while the TR-52 stretches those choices to fifteen (1 second-1 hour).
Each unit allows you two choices of recording method:
One Time Method: when 16,000 readings have been reached recording stops.
Endless Loop Method: when 16,000 readings have been reached it automatically overwrites oldest data.