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TopTes PT520A+ Review: A 17 Inch Gooseneck and a Published PPM Range

Two specifications decide whether a gas sniffer is useful in a real house: how far it reaches and what concentrations it reports. This listing publishes both.

By the Akermin Editorial Team · 4 min read

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TopTes PT520A+ Review: A 17 Inch Gooseneck and a Published PPM Range

TOPTES · PT520A+ Rechargeable Gas Leak Detector, Natural Gas Detector with 17-inch Probe, Checking Combustible Leaks Like Propane, Methane, Butane for Home, HVAC and RV - Orange

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Price and availability are shown on Amazon and can change at any time.

Verdict

The TopTes PT520A+ is the gooseneck version of the pocket sniffer, and it publishes the specifications that matter. The listing states a 50 to 10,000 ppm detection range, a 17 inch bendable gooseneck, a 0.5 second reaction to combustible gas, seven coloured bars with a 75 decibel buzzer that intensify with concentration, rechargeable operation rated for over 3,000 cycles, and a 30 second preheat. For a household with gas appliances, or a technician who needs to reach behind them, this is the more capable of the two formats.

Documented Specifications

Item Manufacturer listing
Detection range 50 to 10,000 ppm
Probe 17 inch bendable gooseneck
Response 0.5 seconds
Indication Seven coloured bars, 75 dB buzzer, both intensifying
Gases Methane, propane, natural gas, LPG
Power Rechargeable, over 3,000 cycles
Preheat 30 seconds

Seventeen Inches Changes Which Jobs Are Possible

Look at where gas fittings actually are in a home. The range connector sits behind the range. The water heater union is above the tank against a wall. The furnace gas valve is inside a cabinet. The meter is often in an enclosure. Every one of those is out of reach for a rigid pocket unit and within reach of a 17 inch flexible probe.

The alternative is pulling the appliance out, which turns a two minute check into a half hour job and risks disturbing the very connection you were testing. A gooseneck is the difference between checking a fitting and deciding not to bother.

Understanding the 50 to 10,000 PPM Range

These numbers look low until converted. Ten thousand parts per million is 1 percent by volume. Methane does not become flammable until around 5 percent, which is 50,000 ppm. So the instrument’s entire range sits below a fifth of the explosive limit.

That is exactly right for the job. A sniffer exists to find leaks long before anything is dangerous, and a detector that only responded near the explosive limit would be useless for locating a weeping joint. The floor of 50 ppm is what makes a small leak detectable at the fitting. See ppm versus LEL for the full conversion.

Seven Bars Beat a Beep

A detector that simply alarms tells you gas is present somewhere nearby. A seven segment bar display tells you whether you are getting closer, which is how you actually find the source among several nearby joints. Combined with a buzzer that intensifies, you can work by ear while watching where the probe tip is going, then look at the display to confirm which position gave the strongest response.

Rechargeable, With a Caveat

Over 3,000 recharge cycles is a long service life and removes the running cost of batteries. The caveat is the one that applies to every rechargeable safety tool: it has to be charged. A detector in a drawer for six months may be flat when an emergency arrives, whereas an alkaline powered unit usually is not. Charge it periodically whether or not you have used it, and check it before you need it.

Technique

  • Preheat in clean air, outdoors or in a room you are sure about.
  • Bend the gooseneck before you approach, not while your hand is behind an appliance.
  • Sweep slowly along joints, an inch per second, with the tip within a centimetre.
  • Natural gas rises, propane sinks. Search accordingly.
  • Confirm with soapy water, and call the utility if you smell gas strongly.

Strengths

  • Published detection range, unusual in this category.
  • Seventeen inch gooseneck reaching real fittings.
  • Seven bar indication for closing in on a source.
  • Rechargeable with a long stated cycle life.

Limitations

  • No runtime per charge stated.
  • No selectable sensitivity modes, unlike the Klein ET120.
  • Does not detect carbon monoxide.
  • Rechargeable tools need charging discipline.

How It Compares

The PT177 is the pocket version for accessible fittings. The UEi CD100A offers an 18 inch gooseneck with a tip light, and the Klein ET120 adds two sensitivity bands. Our ranking is in the handheld gas leak detector roundup.

How We Research

All figures come from the manufacturer listing. The ppm to percent conversions are ours and are shown so you can check them. We did not run laboratory tests.

PT520A+ Rechargeable Gas Leak Detector, Natural Gas Detector with 17-inch Probe, Checking Combustible Leaks Like Propane, Methane, Butane for Home, HVAC and RV - Orange

PT520A+ Rechargeable Gas Leak Detector, Natural Gas Detector with 17-inch

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Natural Gas Detector, TopTes PT177 Gas Leak Detector with Audible & Visual Alarm, Portable Gas Sniffer to Locate Combustible Leak Sources Like Methane, Propane for Home (Includes Battery x2)-Orange

Natural Gas Detector, TopTes PT177 Gas Leak Detector with Audible

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Klein Tools ET120 Gas Leak Detector

Klein Tools ET120 Gas Leak Detector

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Products shown because their documented specifications fit this guide. Price and availability are on Amazon and can change.

Frequently Asked Questions

What is the detection range?

The listing states 50 to 10,000 ppm, which covers the concentrations found at a leaking fitting. Methane does not become flammable until around 50,000 ppm, so this entire range sits well below the explosive limit.

How long is the probe?

A 17 inch bendable gooseneck, per the listing, described as reaching water heaters, dryers, kitchen stoves, fireplaces and propane grills.

How long does the battery last?

The listing states over 3,000 recharge cycles rather than a runtime figure. Check the datasheet for hours per charge if you need to plan a long session.

Does it need a warm-up?

Yes. The listing states 30 seconds of preheating before operation, and as with every sniffer that should happen in clean air, not at the suspect fitting.

Affiliate disclosure: Akermin earns a commission from qualifying Amazon purchases made through links on this page. Our editorial picks are based on documented specifications and owner feedback, not commissions.