COMET D3121 – Thermo-Hygrometer with External Probe & Data Logger

The Comet D3121 is the professional thermo-hygrometer with external probe and integrated data logger for temperature, humidity, and dew point. With storage for 16,000 values, alarm function, hold, and USB transfer – ideal for precise long-term monitoring. 

The Comet D3121 is a high-quality thermo-hygrometer with an external probe, designed for measuring and recording temperature and relative humidity. The device stores measured values in an internal non-volatile memory and enables convenient data evaluation on a PC.

The Comet D3121 provides audio and visual alarms for limit violations, storage of minimum and maximum values, as well as a hold function for manually saving current measured values. The backlit LCD display ensures clear readability. At the same time, temperature, relative humidity, and the dew point are displayed – the dew point display is selectable.

As a full-featured data logger, the Comet D3121 stores up to 16,000 measured values. The recording intervals are freely adjustable from 10 seconds to 24 hours. Data transfer is carried out easily via the supplied mini USB cable. During PC connection, no measurement or recording is possible to ensure data integrity.

The external temperature-humidity probe (diameter 18 mm, length 135 mm) enables flexible measurements even in hard-to-access locations.

Why the Comet D3121 is the best thermo-hygrometer with data logger:

• Integrated data logger with 16,000 measured values
• External probe
• Precise temperature and humidity measurement
• Selectable dew point display
• Audio and visual alarm for limit monitoring
• Min/Max memory and hold function
• Backlit LCD display
• Simple data transfer via mini USB
• Free full version COMET Vision software
• Traceable calibration certificate included

Technical data:

• Temperature measuring range: -30 to +105 °C
• Temperature accuracy: ±0.4 °C
• Humidity measuring range: 0 to 100 % RH
• Humidity accuracy: ±2.5 % RH (5 to 95 % at 23 °C)
• Dew point measuring range: -50 to +80 °C
• Memory capacity: 16,000 values (non-cyclic)
• Recording interval: adjustable from 10 s to 24 h
• Battery life: approx. 6 months
• Dimensions: 191 x 71 x 27 mm
• Probe dimensions: 135 mm length, 18 mm diameter

Available variants:

• Cable length 1 meter
• Cable length 2 meters
• Cable length 4 meters

Scope of delivery

• D3121 thermo-hygrometer with external probe and cable length depending on selection
• Operating manual
• Traceable calibration certificate
• 9 V battery
• Mini USB cable
• Plastic carrying case
• Self-Adhesive Dual Lock for easy mounting
• Free full version of the COMET Vision analysis software