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-35 to 80 Degree Celsius Sound And Light Alarm Temperature And Humidity Data Logger

Model Number: DWL-20E/DWL-21E

Reference Price:$ 20.00~30.00
1. High accuracy industrial grade sensors and components, high-quality and low cost
2. Large scale HTN LCD display
3. For high precision temperature / humidity measurement, recording and monitoring
4. Be widely used in GSP and GMP certification
5. The alarm limit can be set; sound and light alarm if exceeding the setting limit
6. With a real-time clock
7.The length of probe can be customized
8. Replaceable AAA 1.5V battery can work for approx. one year 
9. This product can measure and store up to 32,000 readings
10. User can choose sample rate from 1s to 24 hours.
11. The professional software DGraph can be so easily used to setup, download data, view graph, and output report
12. The data output file type: Excel, txt, jpg, CSV, bmp, PDF etc.
13. The exclusive software DGraph supports professional application so easily
14. The excellent antistatic design can guarantee a long-life steady operation and make the system applicable to a long-term work under the harsh temperature and humidity environment
15. Formulas, data curves and units can be self-defined by users

These data loggers are mainly used to monitor and verify temperature/humidity-sensitive goods, equipment or areas. 
Example: Cold Chain    Refrigeration   Transportations   HVAC   Food & Pharmaceutical Warehouse
These data loggers can measure and store humidity/temperature readings automatically. It has a large LCD that can display real time readings and logging information. They can start a sound and light alarm if exceeding user’s setting limits, making it easy to monitor in real time. An external probe can be customized to several meters long so that user can monitor under the various application fields.
More professional applications can be provided by the unique PC software DGraph under Windows XP /7/8/10 (32/64 bits). User can easily use the software to setup and download data to PC via USB. And user can view, analyze and print the data, meanwhile export several file formats (txt, XLS, CSV, BMP, jpg). This software can support that multi-data loggers and multi-parameters can be graphed and analyzed simultaneously.  Users can easily set sample rate, download password, start and end method.






Temperature Accuracy(Typ.)

±03°C  (±0.5°F)

±03°C  (±0.5°F)

±03°C  (±0.5°F)

±03°C  (±0.5°F)

Humidity Accuracy(Typ.)

±3 %RH

±2 %RH

±3 %RH

±2 %RH

Temperature Range

-35 to 80°C    (-31 to 176°F)

-35 to 80°C
(-31 to 176°F)

-40 to 125°C
(-40 to 257°F)

-40 to 125°C
(-40 to 257°F)

Humidity Range

0 – 100%RH


0.1 ℃ (0.2°F) / 0.1%RH

Sensor Location



Sample Rate

1s to 24h

Memory Capacity


PC Software

DGraph software and USB driver required (Included in CD) 

Operating System

Supporting Win XP/7/8/10 (32bits/64bits)



Power Supply

User Replaceable AAA1.5V Battery, or USB interface to Power

Communication Interface


Case Material And Weight

ABS; Approx. 130 grams(4.59 oz)

Typical Application

Cold Chain    Refrigeration   Transportations   HVAC   Food & Pharmaceutical     Warehouse

Packing List

Software and Manual in CD, Battery, Data Logger

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