Fieldpiece SRH3 In-Duct Digital Psychrometer

Minimum Purchase:
1 unit
  • Fieldpiece SRH3 digital wet bulb thermometer and psychrometer
  • Fieldpiece SRH3 psychrometer
MSRP: $254.00
Price: $215.90
— You save $38.10


Fieldpiece SRH3 In Duct Psychrometer

The SRH3 In Duct Psychrometer is a great tool to properly charge fixed resistor systems by quickly determining the target superheat, and to help verify evaporator performance with the evaporator split test. To assist HVACR professionals get the proper measurements, Fieldpiece engineered this in-duct psychrometer to take measurements in the duct where they are supposed to be taken, in the duct! Measures temperature, relative humidity and calculates wet bulb and dew point temperatures.

The 38" telescoping probe's laser etched ruling and flattened edges allows techs to locate proper measurement points within a duct, and ensures that the probe is properly aligned. With the quick sensor it's a snap to determine target superheat, and take target evaporator exit temperature tests.

Designed specifically for HVACR professionals, the SRH3 InDuct Diagnostic Psychrometer is a great tool to properly charge fixed restrictor systems. More than 70% of A/C units are improperly charged, and therefore running inefficiently, but with the SRH3 it's easier to ensure units are running at their maximum efficiency.

  • Measures temperature and %RH
  • Calculates wet bulb and dew point
  • Slim 38" telescoping probe
  • Fast response time
  • Depth and direction indicators
  • Hands-free testing with stabilizing cone and magnetic hanger
  • Calculates target superheat and target evaporator exit temperature


  • Telescoping Probe Length: Up to 38 inches (97cm)
  • Probe Tip Diameter: 0.35 inch (9mm)
  • Storage temperature: -4°F to 140°F (-20°C to 60°C), 0 to 80% RH (with battery removed)
  • Temperature Coefficient: 0.1 x (specified accuracy)/°C (28°C)
  • Over range: "OL" or "-OL" is displayed
  • Power: Single standard 9-volt battery, NEDA 1604, JIS 006P, IEC 6F22
  • Auto Power off: after 15 minutes of inactivity if APO is active.
  • Battery life: 150 hours typical (alkaline)
  • Low Battery Indication: is displayed when the battery voltage drops below the operating level.
  • Dimensions: 7.9 in (H) x 2.6 in (W) x 1.4 in (D), [200mm (H) x 66mm (W) x 36mm (D)]
  • Weight: Approx. 400g, including battery


  • Sensor type: Precision thermistor
  • Operating environment: -4°F to 140°F (-20°C to 60°C)
  • Range: -4°F to 140°F (-20°C to 60°C)
  • Resolution: 0.1°F / 0.1°C
  • Accuracy: ±(1°F) 32°F to 113°F
  • ±(2°F) -4°F to 32°F, 113°F to 140°F
  • ±(0.5°C) 0°C to 45°C
  • ±(1°C) -20°C to 0°C, 45°C to 60°C

Relative Humidity:

  • Sensor Type: Capacitance polymer film
  • Operating environment: 32°F to 131°F (0°C to 55°C)
  • Range: 0% to 100%RH
  • Accuracy: ±(2.5%) 10% to 90%RH
  • ±(5%) 90%RH
  • Note: Above accuracies stated at 73.4°F (23°C).
  • Sensor Response Time: 60 seconds typical for 90% of total range.
  • Sensor Hystersis: ±1%RH typical (Excursion of 10% to 90% to 10%RH)


  • In Duct digital psychrometer - SRH3
  • Stabilizing cone
  • Blow-molded case with padding



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