Extech 42280A Temperature and Humidity Data Logger

Extech 42280A Temperature and Humidity Data Logger

High-Precision Environmental Monitoring with Storage for up to 48,000 Readings, USB Connectivity, and Automatic PDF Report Generation for Scientific Research and Conservation

The Extech 42280A is an advanced data logger specifically designed for continuous monitoring of environmental conditions in scientific research, natural resource management, and ecosystem conservation. This high-precision portable instrument simultaneously measures temperature, relative humidity, and dew point, displaying all information on an easy-to-read triple LCD with integrated date and time stamps. Its expanded internal memory stores up to 24,000 readings per parameter (48,000 total readings), making it ideal for long-term environmental monitoring in the field, laboratories, museums, archives, greenhouses, or biological sample storage facilities.

Equipped with an integrated USB interface, the logger functions as a self-contained USB drive with built-in configuration software, allowing users to export analytical reports with detailed graphs directly in PDF or Excel format when connected to a PC. It also features configurable visual and audible alarms that immediately notify users whenever environmental conditions exceed preset limits, helping protect valuable biological resources, research projects, and sensitive environmental monitoring applications.

Key Features

• Triple LCD simultaneously displays relative humidity, temperature, date, and time.
• Continuous and accurate monitoring of essential environmental parameters.
• Configurable audible and visual alarms notify users when measurements exceed preset thresholds.
• Stores up to 48,000 total readings (24,000 temperature and 24,000 humidity readings) with time and date stamps.
• Direct export of analytical reports with graphs and statistics in PDF or Excel format when connected to a PC.
• Flexible configuration through the built-in keypad or PC software.

• Specifications
• In the Box
• Required Items
• Optional Items

• Model / Version	Standard Model	NIST Model (Traceable Calibration Certificate)
  Temperature Measurement Range	-30 °C to 70 °C (-22 °F to 158 °F) *Note: Logger operates down to -20 °C (-4 °F)	-30 °C to 70 °C (-22 °F to 158 °F) *Note: Logger operates down to -20 °C (-4 °F)
  Basic Temperature Accuracy	±0.5 °C (±0.9 °F)	±0.5 °C (±0.9 °F)
  Maximum Temperature Resolution	0.1 °C / °F	0.1 °C / °F
  Relative Humidity Range	0 to 100% RH	0 to 100% RH
  Basic Humidity Accuracy	±3% RH (10 to 90% RH)	±3% RH (10 to 90% RH)
  Maximum Humidity Resolution	0.1% RH	0.1% RH
  Dew Point Calculation	0 °C to 50 °C (32 °F to 122 °F)	0 °C to 50 °C (32 °F to 122 °F)
  Sampling Rate	Selectable: 30 s, 5 min, 10 min, 30 min, 60 min, 90 min, 120 min	Selectable: 30 s, 5 min, 10 min, 30 min, 60 min, 90 min, 120 min
  Memory Capacity	24,000 temperature readings and 24,000 humidity readings	24,000 temperature readings and 24,000 humidity readings
  Power Supply	4 × 1.5 V AA batteries (or optional 9 V AC adapter)	4 × 1.5 V AA batteries (or optional 9 V AC adapter)
  Operating Conditions	-20 °C to 70 °C (-4 °F to 158 °F); <90% RH non-condensing	-20 °C to 70 °C (-4 °F to 158 °F); <90% RH non-condensing
  Dimensions	12.07 × 8.89 × 3.81 cm (4.75 × 3.5 × 1.5 in)	12.07 × 8.89 × 3.81 cm (4.75 × 3.5 × 1.5 in)
  Weight	0.163 kg (5.7 oz)	0.163 kg (5.7 oz)
  Certifications	CE	CE / NIST Traceable Calibration Certificate
  Warranty	2 years (6 months for cables and sensors)	2 years (6 months for cables and sensors)

• • 1× Extech 42280A Temperature and Humidity Data Logger
  • 1× Windows-compatible configuration software
  • 1× USB connection cable
  • 1× Universal AC power adapter
  • 4× 1.5 V AA batteries
• • AA batteries
• • Humidity Calibration Kit
  • 9 V AC Power Adapter