RH550: Humidity/Temperature Chart Recorder with Touch Screen

Datalog relative humidity, temperature, and calculated dew point on interactive, 7-inch (178 mm) color Touch-screen

Simultaneously datalog and monitor relative humidity, temperature, and calculated dew point on the Extech RH550. It features live or user-scheduled recording time and programmable Min/Max alarm set points. A built-in stand is included for desktop use, as well as a bracket for wall-mounting. The RH550 also features a field-replaceable probe that can be attached to the monitor or on a 6.5 ft (2 m) cable. This recorder is useful in office buildings, conference rooms, labs, hospitals, cleanrooms, greenhouses, food storage facilities, and more.


SKU: RH550 Category: Tags: ,


  • Large 7″ (178 mm) high-resolution color TFT LCD (1024 x 600 pixels) with display zoom feature, interactive touch screen menu, and screen capture capability with finger swipe
  • Simultaneous numerical and graphical display of real-time Humidity, Temperature and Dew Point readings, plus Time and Date in Live Mode
  • Internal 16 GB memory for capturing up to 20,000 data points in CSV format that can be transferred to a computer via USB port
  • User selectable 1 second to 24 hour sampling rate
  • Audible and visual alarm with Hi/Low set points
  • View recorded alarm values by date sorting or by temperature and humidity values
  • Memory progress bar indicates used memory and percentage of free memory remaining
  • Recall saved data files using History Mode
  • MIN/MAX records minimum and maximum values for all 3 units of measure
  • Field-replaceable probe does not require recalibration
  • Probe can either be clipped directly onto the tablet or attached to a cable to extend up to 6.5 ft (2 m) for measurements in closed environments
  • Up to 3 probe cables (RH550-C) can be connected together (one is included)
  • Desktop or wall mount
  • Complete with built-in stand, wall mount bracket, RH550-P detachable probe, RH550-C probe cable (6.5 ft / 2 m), USB cable, universal adaptor with multiplugs (US, EU, UK, AU), and internal rechargeable battery



Relative Humidity10% to 95% RH0.1% RH±2.5% RH
Temperature (sensor directly attached to tablet)14 to 104°F (-10 to 40°C)0.1°±0.9°F (±0.5°C)
Temperature (sensor attached to cable)-4 to 176°F (-20 to 80°C)0.1°±0.9°F (±0.5°C)
Dew point (calculated)-4 to 176°F (-20 to 80°C)0.1°
Internal Memory Storage16 GB
Sample Rate1 sec to 24 hrs
Extension CableConnect up to 3 cables (RH550-C)
DimensionsTablet: 7.8 x 4.6 x 1″ (198 x 118 x 25.7 mm)
Viewable Screen: 7″ (178 mm)
RH550-P probe: 3.1 x 0.6 x 0.4″ (79 °— 15.8 °— 10 mm)
RH550-C cable: ~6.5 ft (198 cm) cable length; ~6.9 ft (210 cm) cable length and two end connectors
WeightTablet: 12.9 oz (365 g)
Tablet with probe and cable: 15 oz (425 g)
RH550-P probe: 0.4 oz (11.3 g)
RH550-C cable: 1.7 oz (47 g)