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Fieldpiece · Fieldpiece - Job Link System Dual Port Manometer Probe Kit - JL3KM2 - Long Range Wireless All-in-One Static, Gas and Draft Pressure Gauge - HVAC Tools
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The JL3KM2 is worth understanding as a pair of independent pressure sensors packaged as probes, not as a gauge with hoses. The listing states a 1000 ft wireless range, up to eight simultaneous readings, switchable the Fieldpiece JL3KM2 and the Goldeep Decibel Meter indication, and a kit that includes two ASP2 static pressure probes with hoses, brass screw fittings with extra hose, two slide gas adapters, four AAA batteries and a padded case. It suits technicians who need return static, supply static and total external static pressure taken at the same time from ports that are not next to each other. The listing does not publish pressure range, resolution, accuracy or battery life, so those numbers cannot be confirmed here.
Two sensors on two probes: the mechanism that separates this kit from a hose-fed manometer
A conventional manometer is one pressure sensor inside a box. You run a hose from the box to the test port. The sensor sees whatever pressure reaches it through that hose, and the hose length, its routing and any condensate in it all become part of the measurement path.
The JL3KM2 splits that arrangement. The listing describes independent sensors placed directly on the test ports, with a short hose length and an untethered design. Each probe carries its own sensor, and the wireless link carries the reading back rather than a column of air. The stated wireless range is 1000 ft.
That matters for static pressure work because the two readings you usually want, return static and supply static, are taken at opposite sides of the air handler. With a single-sensor box and a hose, you take one, write it down, move the hose, and take the other. With two independent probes you can leave one on each port and read both at once. The listing states up to eight readings at once in real time, including return static, supply static and total external static pressure.
The listing also states a switchable the Fieldpiece JL3KM2 and the Goldeep Decibel Meter indicator for individual pressure readouts, so the kit can be used as a single, dual or multiport measurement. In practice that means the two probes are not locked into a differential pair; each can be read on its own.
The 1000 ft range claim and what it does not tell you
The listing states a 1000 ft wireless range. That is a line-of-sight style figure and it is the kind of number that shrinks in a real building. Steel ductwork, masonry walls, mechanical rooms below grade and crowded 2.4 GHz space all reduce it. The listing does not publish the radio band, the transmit power or the conditions under which 1000 ft was measured, so treat the figure as an upper bound rather than a promise for a basement air handler with the reader two floors up.
The practical question is not whether the probes reach 1000 ft. It is whether they reach from the test port to wherever you need to stand to see the display. For most residential and light commercial work that is a much shorter distance, and the untethered design is the real benefit, not the maximum range.
The listing does not publish how the probes pair, how many probes one display can hold, or what happens to the reading if the wireless link drops. Those are questions to resolve before relying on the kit for a commissioning record.
What the kit includes, and the fittings that decide where it fits
The listing is specific about the contents: two ASP2 static pressure probes with hoses, two brass screw fittings with extra hose, two slide gas adapters, four AAA batteries and a padded case.
The two adapter types point at two different jobs. The static pressure probes are for duct test ports, the kind you find on an air handler or a plenum. The slide gas adapters are for gas valve pressure taps, the small ports on a gas valve or manifold where you check supply and manifold pressure. The brass screw fittings with extra hose extend the reach where a port is awkward to get to.
What the listing does not state is the pressure range of either sensor, the resolution, the accuracy, the units available, or whether the gas adapters are rated for the pressures involved in gas valve testing. Those are exactly the numbers a buyer would want, and they are not in the listing bullets. Do not assume them from the product class.
Where the probe format stops being the right answer
Wireless probes are the right shape for static pressure and draft work because the ports are spread out and the readings are steady. They are a poorer fit for anything that needs a fast, continuous, hands-on sweep. If you are chasing a fluctuating draft reading or checking a pressure switch that clicks on and off, a probe that sits on the port and reports wirelessly adds a layer between you and the sensor. A handheld manometer with a short hose lets you watch the number move as you work the control.
The kit is also not a combustion analyser and not a gas leak detector. The slide gas adapters let you read pressure at a gas valve tap; they do not tell you whether the gas is burning correctly and they do not sniff for leaks. If that is the job, the relevant comparison on this site is gas detectors for HVAC technicians.
And it is not an airflow meter. Static pressure is one input to airflow work, but the kit does not measure velocity or CFM. For that you need a different instrument, such as the class covered in differential pressure meters for HVAC.
The maintenance the listing does not mention
Pressure sensors drift, and the listing does not publish a calibration interval, a zeroing procedure or an accuracy figure. That silence matters more than any feature on the page, because a manometer that reads 0.02 in w.c. when the port is open will quietly bias every static pressure reading you take.
The practical habits are the usual ones for this class of instrument: zero the probes with the ports open before a run, keep the hoses and adapters clean and dry, and check the brass fittings for cross-threading. The padded case is there for a reason, since a probe that has been dropped is a probe you should re-check against a known reference.
The listing does not state whether the probes are field-calibratable or must be returned. Ask before you buy if calibration records are part of your work. The general principles are covered in why gas detectors need bump tests and calibration, and the same discipline applies to any pressure instrument you rely on.
The JL3KM2 in one paragraph
Buy the JL3KM2 if your work is static pressure and draft measurement at ports that are not next to each other, and you want the two readings live at the same time without dragging hose across the unit. The independent probes and the stated 1000 ft wireless link are the mechanism, and the kit contents cover the common duct and gas valve ports. Do not buy it expecting published accuracy, resolution or pressure range, because the listing does not give them. If you need a fast-sweeping handheld for pressure switches, or you need airflow in CFM, this is the wrong instrument and a different page on this site is the right one.
Recommended Tools
Products shown because their documented specifications fit this guide. Price and availability are on Amazon and can change.
Frequently Asked Questions
Does the JL3KM2 measure differential pressure directly?
The listing describes independent sensors, individual pressure readouts and a switchable the Fieldpiece JL3KM2 and the Goldeep Decibel Meter indicator, plus single, dual and multiport measurement. It does not publish a differential mode as such. If you need a dedicated differential reading, confirm with the manufacturer before relying on it.
What is the pressure range and accuracy?
Not stated in the listing bullets. The listing gives the wireless range, the number of simultaneous readings and the kit contents, but not the pressure range, resolution or accuracy. Those figures should be obtained from the manufacturer before purchase.
Can I use it on gas valve pressure taps?
The kit includes two slide gas adapters, which the listing presents as part of the kit for gas pressure work. The listing does not publish a pressure rating for those adapters, so confirm the rating matches the pressures you intend to apply.
How many probes can one display handle?
The listing states up to eight readings at once in real time, but it does not state how many physical probes a single display supports or how pairing works. That is a question for the manufacturer.
Does it log data?
The listing states that it can measure, view and record up to eight readings at once in real time. It does not publish logging interval, memory capacity or export format. Treat the recording function as stated but unspecified until you confirm the details.
What batteries does it use, and how long do they last?
The kit includes four AAA batteries. The listing does not publish battery life or whether the probes and display use separate cells. Battery life is not stated.
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