HOME > EXTECH > THERMOMETERS > HD550 extech logo

Extech HD550
Psychrometer + IR Thermometer with GPP (g/kg)
See: SDL550

  • Water vapor in GPP (grains per pound)/g/kg (grams per kilogram)
  • Built-in InfraRed Thermometer for non-contact temperature measurement to 932°F (500°C) with 30:1 distance to target ratio
  • Type K Temperature function for contact temperature measurement to 2501°F (1372°C)
  • Highest 2% RH accuracy
  • Heavy Duty rugged double molded housing with large triple LCD backlit display
  • Auto power off
  • Includes Windows compatible software with USB cable, Type K bead wire temperature probe (-22 to 572°F/-30 to 300°C), built-in stand, hard carrying case, and 9V battery
Click here for a larger image - Extech HD550 Psychrometer + IR Thermometer with GPP (g/kg)Click for larger image
Extech HD550 Shown

Product Information
Datasheet 260 KB PDF
Manual 180 KB PDF
PDF HelpPDF Help
Specifications HD550
Specification Range Basic Accuracy
InfraRed Thermometer -58 to 932°F (-50 to 500°C) ±2% or ±4°F/2°C
Distance to Target Ratio 30:1
Type K Temperature -148 to 2501°F (-100 to 1372°C) ±(1% + 1°C)
Air Temperature 14 to 140°F (-10 to 60°C) ±(2% ±4ºF/2°C)
RH Range 0 to 100%RH ±2%RH
Dew Point -90.4 to 140°F (-68 to 60°C)
Wet Bulb -6.88 to 140°F (-21.6 to 60°C)
Mixing Ratio 0 to 999GPP (0 to 160g/kg)
Dimensions 10 x 2.9 x 2" (255 x 75 x 50mm)
Weight 12.3oz (350g)
Ordering Information
Model Description Buy Online Price
HD550 Extech HD550 Hygro-Thermometer and IRG PP Version Discontinued
See: SDL550
HD550-NISTL Extech HD550-NISTL Hygro-Thermometer W/Limited NIST Discontinued
See: SDL550-NIST
Included Accessories
  • 1 - Type K Temperature Probe
  • 1 - Built in stand
  • 1 - USB Cable
  • 1 - Software
  • 1 - 9V battery
  • 1 - Carrying Case


*NOTE: Items ordered with optional NIST calibration will require
approximately 10 days to complete the certification.