Diagnostic Sling Psychrometer - SRH2

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Diagnostic Sling Psychrometer - SRH2

The SRH2 Diagnostic Psychrometer performs all the normal functions of a digital psychrometer plus it calculates target superheat and target evaporator exit temperature from psychometric measurements.

Diagnostic Digital Psychrometer - Temperature, %RH, WB, Dew Pt. - PLUS - Target Superheat and Target Evaporator Exit Temp
The SRH2 Diagnostic Psychrometer is an easy to use hand-held diagnostic instrument that performs the normal functions of a digital psychrometer plus it calculates critical air conditioning system targets from psychometric measurements.

  • Measures temperature (DB) and %relative humidity (%RH)
  • Calculates wet bulb (WB) and dew point (DP)
  • Calculates Target Superheat (TSH)
  • Calculates Target Evaporator Exit Temp (TEET) (aka - delta T, temp split)
  • Only digital psychrometer that takes measurements using an electronic sensor (NTC) or k-type thermocouples (T/C)


How Does it Work?


Normal Mode (NORM)

For use as a normal digital psychrometer press the TSH/TEET/NORM button until NORM is displayed on the screen. Select the NTC sensors for quick accurate readings electronically.

Target Superheat Mode (TSH)

Target superheat (TSH) is the first step in determining charge on a fixed orifice system. Compare your TSH to your ACTUAL superheat to determine whether refrigerant needs to be added or recovered. Up until now you had to take the measurements, find a target superheat chart and find the target. Now the chart is in you meter. ENTER your outdoor dry bulb, ENTER indoor wet bulb, press OUTPUT and your TSH is displayed.

To get started, press the TSH/TEET/NORM until TSH (target superheat) is displayed on the screen.

The easy way - For indoor wet bulb, use the NTC and press RH/DP/WB/DB until ID (indoor) and WB are displayed on the screen. For outdoor dry bulb measurements use the NTC and press the RH/DP/WB/DB button until DB is displayed. Let reading stabilize and press enter to lock it in.

For even more accurate readings - Use the included wet and dry bulb thermocouples. Wet and clip the ATWB1 T/C to the return air filter and push the filter back in line. Select T/C and ID WB using the RH/DP/WB/DB button. Clip the ATA1 beaded T/C to the condenser and make sure T/C, OD, and DB are displayed.

Target Evaporator Exit Temperature Mode (TEET)

Target Evaporator Exit Temperature is also called delta T, temp split, temp drop across the coil. Whatever you call it, TEET is an important first step in diagnosing capacity and airflow problems.

To get started, press the TSH/TEET/NORM until TEET is displayed on the screen.

Wet the ATWB1. Clip both the included wet and dry bulb T/Cs to the return air filter and push the filter back in line. Plug the ATWB1 into the top of the meter. Press RH/DP/WB/DB until WB is displayed. Press SENSOR until T/C is displayed. When reading is stable, press ENTER. Unplug the ATWB1 and plug in the ATA1. Press RH/DP/WB/DB until DB is displayed. Press SENSOR until T/C is displayed. When reading is stable, press ENTER. Press OUTPUT to get your TEET.

Take a dry bulb measurment in the supply air after the evaporator to get your ACTUAL Evap. Exit Temp. Compare to your TEET reading. An ACTUAL Evap. Exit Temp. above the TEET usually indicates low capacity. Occasionally airflow is higher than expected. Look for causes of low capacity such as refrigerant mischarge or a dirty condenser coil. If the airflow is high, correct it by lowering the fan speed.


Features and Benefits

The SRH2 Diagnostic Psychrometer offers several unique features and benefits to technicians, contractors, instructors and students:

  • It's a digital psychrometer.
  • It's a diagnostic tool with TSH and TEET built in. No charts to fumble with.
  • Choose the NTC or the included WB and DB T/Cs for testing, You decide.
  • Faster testing and system diagnosis.
  • Higher quality job.
  • Test multiple parameters with one instrument.
  • All this for about the same cost as competitive digital psychrometers.
  • Quick, easy testing from two sensor sources.
  • Clip thermocouples to keep them in place during tests.
  • Auto power off (APO) after 15min of inactivity
  • MAX/MIN/Hold Functions
  • Easy to access thermocouple synchronization
  • Bright blue Backlight
  • Magnetic hanger and rugged rubber boot for functionality and durability.

Competitive Advantages

There are other digital psychrometers on the market. None are like the SRH2.

  • DIGITAL PSYCHROMETER PLUS DIAGNOSTIC TESTING: Target Superheat, Target Evaporator Exit Temperature tests included. Most psychrometers only give you Temp, %RH, WB, and Dew Point.
  • TWO SENSORS: The SRH2 is the only psychrometer that uses either k-type thermocouples or a NTC for testing. You decide how you want to use it. The thermocouple advantage gets you into places other digital psychrometers can't go.
  • RUGGED: The SRH2 is built like all of our hand-held meters. Ruggedized for the type of punishment testing in the field can dish out.
  • COMPETITIVE PRICE: The SRH2 Diagnostic Psychrometer is competitively priced with "normal" digital psychrometers. You deserve the diagnostics with your psychrometer, so we include them.
  • ERGONOMIC DESIGN: The SRH2 fits easily in your hand because it uses our ergonomic hand-held design. Other testers fit in your hand too, but you'll need your other hand for all of the charts, notepads and a calculator.
  • MADE FOR TECHS WITH TECHS: As with all of our instruments, the SRH2 Diagnostic Psychrometer was developed with you, the HVAC/R technician, in mind to make your job easier, faster and more efficient. Thanks to all who tested with us in the field.


  • Diagnostic Sling Psychrometer - SRH2
  • Wet Bulb Thermocouple - ATWB1
  • Dry Bulb Thermocouple - ATA1
  • 9V battery (installed)
  • Operator’s manual

Technicians who like the SRH2 may also enjoy these instruments and accessories:



HVAC Guide® System Analyzer - HG1

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Digital Sling Psychrometer Accessory - ARH4

The Fieldpiece model ARH4 Digital Sling Psychrometer and Hygrometer Accessory Head measures both relative humidity and ambient air temperature. It calculates dew point and wet bulb. It’s great for calculating target superheat as well as logging %RH, temp, WB or DP over time. The head converts %RH, ambient temperature, dew point temperature, and wet bulb temperature to a voltage at a rate of 1 %RH or degree to 1mVDC and your reading is displayed on your meter. The ARH4 snaps directly onto Fieldpiece stick meters, data logger, electronic handles and adapters.


Superheat and Subcooling for A/C and Refrigeration - SSX34

The Fieldpiece Superheat and Subcooling for Air Conditioning and Refrigeration meter, model SSX34, measures suction line, or low side, line temperature and pressure. It then calculates actual superheat in real time using built-in P/T charts. It also measures liquid line, or high side, temperature and pressure, and calculates actual subcooling.  Use it to get actual superheat on R-22, R-410A, R-134A, and R-404A fixed orifice systems and actual subcooling on TXV / TEV regulated systems.  Use the “T” fitting to charge to actual superheat or subcooling by putting the SSX34 in-line between your refrigerant bottle and the system.


Operating temperature: 0°F - 122°F at <75%RH
Storage Temperature: -4°F to 140°F (-20°C to 60°C) 0 to 80%RH with battery removed.
Low battery indication: The +- symbol is displayed when the battery drops below the operating level.
Battery Life: Approx. 150 hours (9V alkaline)
Auto Power Off: After 15 minutes of non-usage.

Temperature (K-Type Thermocouple):
Range: -58°F to 1832°F (-50°C to 1000°C)
Accuracy: ±1°F 50°F to 113°F (±0.5°C 10°C to 45°C), when calibrated to NTC at room temperature
±(0.1% rdg+2°F) -58°F to 1832°F
±(0.1% rdg+1°C) -50°C to 1000°C

Temperature (NTC):
Range: 32°F to 140°F (0°C to 60°C)
±1°F 50°F to 113°F (±0.5°C 10°C to 45°C)
±4°F 32°F to 50°F and 113°F to 140°F
±2°C 0°C to 10°C and 45°C to 60°C

Relative Humidity: 0% to 100% RH range
Accuracy: ±2.5% at 77°F (25°C), 10% to 90%RH
±5% at 77°F (25°C) 0 to 10% RH & 90 to 100%RH
Dimensions: 7.9”(H) x 2.6”(W) x 1.4”(D)
Weight: Approx. 11oz with battery installed
Accessories: (ATA1) K-type dry bulb thermocouple w/ clip, (ATWB1) K-type wet bulb thermocouple w/ clip, battery and Operator’s Manual.