Fieldpiece JL3RH Job Link Bluetooth Wireless Psychrometer Probe
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Fieldpiece JL3RH Job Link Bluetooth Wireless Psychrometer Probe
The Fieldpiece JL3RH is a wireless psychrometer probe for the Fieldpiece Job Link system, designed to measure supply air temperature and relative humidity in ducts, supply plenums, and elevated registers. The narrow flexible probe — 0.36" diameter and 9.25" long — is sized to fit through standard duct access points and registers without requiring large openings. A configurable magnet allows hands-free mounting during measurements.
The JL3RH connects wirelessly to the Fieldpiece Job Link app via Bluetooth, displaying live temperature and humidity readings alongside pressure and temperature data from other Job Link probes. It is commonly used for supply air temperature and humidity verification during commissioning and system performance checks.
Key Features
- Narrow flexible probe: 0.36" diameter, 9.25" length — fits standard duct access points
- Configurable magnet for hands-free mounting
- Temperature accuracy: ±1°F (±0.6°C)
- Humidity accuracy: ±2.5% RH
- Temperature range: -4°F to 140°F (-20°C to 60°C)
- Humidity range: 0% to 100% RH
- Wireless range: 100+ metres (2.4 GHz BLE 4.0)
- Battery: 2 x AAA alkaline (included) — 150-hour typical life
- Auto power-off: 2 hours
- IP55 water resistant
- Compatible with Fieldpiece Job Link app (iOS and Android)
Best For
- Supply air temperature and humidity measurement in ducts, plenums, and registers
- HVAC commissioning and system performance verification
- Technicians who need airside data alongside refrigerant pressure and temperature readings
- Expanding a Fieldpiece Job Link kit to include air quality diagnostics
Check Before Ordering
- Probe diameter is 0.36" — confirm it fits your duct access points or register openings
- Temperature range is -20°C to 60°C — confirm suitability for your application
- Confirm Bluetooth range is adequate for your jobsite environment
- Confirm Job Link app compatibility with your smartphone OS version
- For a complete kit including the JL3RH, see the JL3KH6 Charge & Air Test Kit
- Confirm warranty terms with HVAC Trade Supply at time of purchase
Frequently Asked Questions
What does a psychrometer measure?
A psychrometer measures both dry-bulb temperature and relative humidity simultaneously. In HVAC applications, this data is used to calculate wet-bulb temperature, dew point, and enthalpy — useful for commissioning, load verification, and system performance checks.
Will the JL3RH fit through a standard duct access point?
The probe is 0.36" (approximately 9mm) in diameter and 9.25" long. Confirm it fits your specific duct access points or register openings before ordering.
Can I use the JL3RH without other Job Link probes?
Yes — the JL3RH connects directly to the Fieldpiece Job Link app as a standalone probe. It can also be used alongside JL3PR pressure probes and JL3PC pipe clamps for a full system diagnostic view.
What is the warranty?
Confirm current warranty terms with HVAC Trade Supply at time of purchase.
Browse the full Fieldpiece Job Link range or contact our team for kit-building advice.