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JL3RH Fieldpiece Job Link® System Flex Psychrometer Probe

Fieldpiece JL3RH Job Link® System Flex Psychrometer Probe
SKU: 123577
Manufacturer part number: JL3RH

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JL3RH – Job Link® System Flex Psychrometer Probe
Amazingly flexible and even more accurate.

Powerful 1000′ wireless range w/no transmitter required
Communicates with Job Link App and Wireless Manifolds (SM380V/SM480V)
Strong magnetic hanger
Supply and return side switch
Water resistant

Job Link® System Psychrometer Probe
The JL3RH Job Link® System Psychrometer Probe has a long flexible wand and strong sliding magnet for easy measurements anywhere on the system. Get instant live readings from ducts, plenums, registers, or grilles for accurate diagnostics. Now handles extreme duct temperatures up to 250°F and as low as -40°F!

A flexible wand with a powerful sliding magnet provides quick and easy measurements anywhere on the system.

Place in critical locations based on system needs
Requires only 3/8″ hole for duct testing
Connect to Job Link App or Wireless SM380V and SM480V Digital Manifolds
You can connect your psychrometers directly to both the Job Link app and the wireless SMAN™ Refrigerant Manifolds (3-port SM380V or 4-port SM480V) to see live air temperatures readings while you’re making adjustments to the system. Data log results in the manifolds, or include in Job Link System reports.

1000’ wireless signal with no transmitter required
Powerful enough to go through most walk-in coolers and freezers
Return and supply indicator switch ensures you’re recording the right measurements in the correct place.

Dry bulb
Wet bulb
Dew point
The JL3RH psychrometer probes are sold as individuals so you can use one or more at a time, or they come included in the Job Link Charge and Air Test Kit.


Job Link System Flex Psychrometer Probe
1 Protective Slip Cover for Sensor Tip
2 x AAA Batteries
Operator’s Manual
1 Year Limited Warranty


Minimum Device Requirement: BLE 4.0 devices running iOS® 7.0 or Android™ 5.0 (Latest compatibility at
Battery Type: 2 x AAA, NEDA 24A, IEC LR03
Battery Life: 150 hours typical alkaline. LED blinks red when battery replacement is needed.
Auto Power Off: 2 hours (APO can be disabled)
Wireless Range: 1000 feet (305 meters) line of sight. Obstructions affect distance.
Radio Frequency: 2.4 GHz
Operating Environment: 32°F to 122°F (0°C to 50°C) at <75% RH
Storage Temperature: -4°F to 140°F (-20°C to 60°C), 0 to 80% RH (with batteries removed)
Temperature Coefficient: 0.1 x (specified accuracy) per 1.8°F (32°F to 64°F, 82°F to 122°F), per 1°C (0°C to 18°C, 28°C to 50°C)
Weight: 0.33 lbs (150 g)
Flexible Probe: 0.36″ (9mm) diameter; 9.25″ (235mm) length
Relative Humidity (%RH)
Sensor Type: Capacitance polymer film
Hysteresis: ±1%RH typical (Excursion of 10% to 90% to 10%RH)
Measurement Range: 0%RH to 100%RH
Accuracy: (At 73.4°F (23°C))
±2.5% (10%RH to 90%RH); ±(5%) <10%RH, >90%RH
Response Time: 60 seconds typical for 90% of total range
Temperature Sensor Type: Precision thermistor
Measurement Range: -40°F to 250°F (-40°C to 121°C)
Accuracy: ±(1°F) 32°F to 113°F, ±(0.5°C) 0°C to 45°C; ±(2°F) -4°F to 32°F, 113°F to 140°F, ±(1°C) -20°C to 0°C, 45°C to 60°C

Products specifications
Attribute nameAttribute value
ManufacturerFieldpiece Instruments
Power Source1.5 V AAA Batteries
Sensor TypeRelative Humidity (%RH) Capacitance polymer film, Temperature Sensor Type: Precision thermistor
Humidity Accuracy±2.5% (10%RH to 90%RH); ±(5%) <10%RH, >90%RH