Brandt Instruments distributing TSI Air Velocity Meters, Ventilation Meters, IAQ Meters, Micromanometers & Thermohygrometers
Environmental Monitoring & Industrial Hygiene Instrumentation
Brandt Instruments DistributingTSI 
TH-Calc® Thermohygrometers
TSI TH-CalcThermohygrometers models 7415, 7425

TH-Calc®  Thermohygrometers
Models 7415, 7425

(Replace Models 8720, 8722)

TH-Calc Thermohygrometers. The Model 7415 Thermohygrometer is a basic instrument that accurately and reliably measures temperature and humidity. It is ideal for use in thermal comfort studies and HVAC system performance testing. The Model 7425 Thermohygrometer is a diagnostic instrument with advanced capabilities, such as data logging, review of statistics and downloading to a PC using LogDat2™ software (included)

Features and Benefits
  • Reliably measures temperature and humidity
  • Calculates wet bulb temperature
  • Easy to read display shows parameters simultaneously
  • Conducting thermal comfort studies
  • Conducting IAQ evaluations
  • Verify building HVAC system performance
  • Troubleshooting heating and cooling systems
  • Monitoring air conditions for manufacturing processes

TSI 7425 Thermohygrometer

Model Comparison - TH-Calc Thermohygrometer

  7415 7425
Temperature x x
%RH, wet bulb x x
Dew point   x
% outside air   x
Data logging/downloading   x
Review data   x
Statistics   x
Field calibration adjustment   x
Certificate of Calibration x x

Specifications TH-Calc Thermohygrometer Models 7415 and 7425

   Range 32 to 140°F (0 to 60°C)
   Accuracy1 ±1.0°F (±0.6°C)
   Resolution 0.1°F (0.1°C)
   Range 5 to 95% RH
   Accuracy2 ±3% RH
   Resolution 0.1% RH
Instrument Temperature Range
   Operating (Electronics 40 to 113°F (5 to 45°C)
   Operating (Probe) 14 to 140°F (-10 to 60°C)
   Storage -4 to 140°F (-20 to 60°C)
Data Storage Capabilities (7425 only) 12,700+ samples and 100 test IDs
Logging Interval (7425 only) 1 second to 1 hour
Time Constant (7425 only) User selectable
External Meter Dimensions 3.3 in. x 7.0 in. x 1.8 in. (8.4 cm x 17.8 cm x 4.4 cm)
  Meter Probe Dimensions
    Length 7.0 in. (17.8 cm)
    Diameter of Tip 0.75 in. (19.0 mm)
Meter Weight with Batteries 0.6 lbs (0.27 kg)
Power Requirements Model 7415 Four AA-size batteries
Model 7425 Four AA-size batteries or optional AC adapter

1 Accuracy with instrument case at 77°F (25°C), add uncertainty of 0.05°F/°F (0.03°C/°C) for change in instrument temperature.
2 Accuracy with probe at 77°F (25°C). Add uncertainty of 0.1% RH/°F (0.2% RH/°C) for change in probe temperature. Includes 1% hysteresis.

Specifications are subject to change without notice.


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    18568 Oak Grove Parkway 
    Prairieville, LA  70769 
Phone: 225-673-6776
    Fax: 225-673-6725

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