A complete product kit for the Klein Tools ET120 featuring the combustible gas leak detector with its 18-inch flexible gooseneck, a custom black padded storage pouch with an orange zipper, and four AAA batteries.
Product feature infographic for the Klein Tools ET120 highlighting its detection range of 50 to 10,000 ppm for Methane and Propane. Icons call out the dual sensitivity levels, audible and visual LED alarms, 18-inch flexible gooseneck, and a 2-meter drop protection rating.
Front view of the Klein Tools ET120 gas detector showcasing the intuitive control interface. The image highlights the five-tier red LED visual alarm bar and buttons for high/low sensitivity selection, power, and the 85dB audible alert toggle.
Action shot of an HVAC professional using the ET120 gas leak detector to inspect a gas line joint. The 18-inch flexible gooseneck is shown maneuvering into a tight space, demonstrating the tool's effectiveness for residential and commercial plumbing diagnostics.
A technician using the Klein Tools ET120 to probe for gas leaks along a yellow corrugated stainless steel tubing (CSST) line. The flexible gooseneck is bent to position the sensor tip precisely at the connection point, illustrating the tool's versatility.
Perspective shot of the ET120 focusing on the over-molded ergonomic grip and the sensor storage clip. The 18-inch flexible gooseneck is shown coiled and clipped to the side of the housing for compact storage and protection.
Close-up of the ET120 sensor head and the 18-inch flexible gooseneck extended for use. The image emphasizes the rugged construction of the gooseneck and the specialized sensor tip designed to detect methane and propane gas concentrations.
Full back-profile view of the Klein Tools ET120 combustible gas leak detector. This view highlights the high-impact polymer housing, the intuitive thumb-controlled buttons, and the flexible 18-inch gooseneck probe in its fully extended position.
A technician troubleshooting a commercial HVAC unit using the ET120 gas leak detector. The flexible probe is reaching into the internal mechanical components to verify the integrity of the gas valves and fittings.
Combustible Gas Leak Detector (ET120) promotional how to video
A complete product kit for the Klein Tools ET120 featuring the combustible gas leak detector with its 18-inch flexible gooseneck, a custom black padded storage pouch with an orange zipper, and four AAA batteries.
Product feature infographic for the Klein Tools ET120 highlighting its detection range of 50 to 10,000 ppm for Methane and Propane. Icons call out the dual sensitivity levels, audible and visual LED alarms, 18-inch flexible gooseneck, and a 2-meter drop protection rating.
Front view of the Klein Tools ET120 gas detector showcasing the intuitive control interface. The image highlights the five-tier red LED visual alarm bar and buttons for high/low sensitivity selection, power, and the 85dB audible alert toggle.
Action shot of an HVAC professional using the ET120 gas leak detector to inspect a gas line joint. The 18-inch flexible gooseneck is shown maneuvering into a tight space, demonstrating the tool's effectiveness for residential and commercial plumbing diagnostics.
A technician using the Klein Tools ET120 to probe for gas leaks along a yellow corrugated stainless steel tubing (CSST) line. The flexible gooseneck is bent to position the sensor tip precisely at the connection point, illustrating the tool's versatility.
Perspective shot of the ET120 focusing on the over-molded ergonomic grip and the sensor storage clip. The 18-inch flexible gooseneck is shown coiled and clipped to the side of the housing for compact storage and protection.
Close-up of the ET120 sensor head and the 18-inch flexible gooseneck extended for use. The image emphasizes the rugged construction of the gooseneck and the specialized sensor tip designed to detect methane and propane gas concentrations.
Full back-profile view of the Klein Tools ET120 combustible gas leak detector. This view highlights the high-impact polymer housing, the intuitive thumb-controlled buttons, and the flexible 18-inch gooseneck probe in its fully extended position.
A technician troubleshooting a commercial HVAC unit using the ET120 gas leak detector. The flexible probe is reaching into the internal mechanical components to verify the integrity of the gas valves and fittings.
Combustible Gas Leak Detector (ET120) promotional how to video
KLEIN TOOLS

Klein Tools Gas Tester ET120 Combustible Leak Detector (50 to 10000 ppm Methane Propane 18 Inch Gooseneck 85dB Alarm HVAC Piping Diagnostics Pouch)

Only 1 left
SKU: ET120
$129.97 USD

Description

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Navigate Confined Pipe Joints and Isolate Vapor Escapes Instantly with Extended Gooseneck Induction Tracking Telemetry

Shop the Klein Tools ET120 combustible gas leak detector engineered to locate fuel vapor escapes in confined mechanical enclosures. This industrial sniffer maps hydrocarbons from 50 to 10,000 ppm, utilizing an 18-inch flexible gooseneck probe to navigate around appliance fittings or hidden manifold seams. Operating with dual sensitivity configurations, an automated baseline zero-calibration routine, and an 85dB ticking alert module, it isolates hazardous lines before catastrophic ignition events occur.

Best Used For:

  • Residential Gas Lines: Probing structural iron threads and yellow flexible copper supply line connections for methane or propane breaches down to 50 ppm.
  • Furnace Manifold Sweeps: Shifting along automated heater manifolds and burner blocks to find micro-fissures in internal infrastructure links.
  • Commercial Boiler Inspections: Evaluating primary line couplings and high-volume utility control setups for localized industrial containment structural audits.

Key Performance & Safety Features

  • 18-Inch Flexible Gooseneck: Extended structural arm contours cleanly around piping paths to reach tight valve clusters and deep ventilation cracks.
  • Dual Threshold Sensitivity: Toggles manually between a high sensitivity track (50 to 1,000 ppm) and a low safety envelope (1,000 to 10,000 ppm).
  • Multi-Sensory Alert Arrays: High-decibel 85dB acoustic buzzer matches a 5-tier red LED array to blast active hazard indicators as density spikes.
  • Auto Zero Calibration: Automated balance logic runs at startup to equalize ambient atmosphere baseline counts for consistent scanning accuracy.
  • Rugged Overmolded Chassis: Double-insulated slip-resistant composite frame prevents accidental tool slips inside wet utility crawlspaces.

What's Included

  • ET120 Combustible Gas Leak Detector
  • Protective Storage Pouch
  • Four AAA Alkaline Batteries
  • Instruction Manual

Technical Specifications

Gas Concentration Scale: 50 to 10,000 ppm (Methane-Calibrated Basis)
Audible Alert Output: 85dB Proportional Ticking Sound Range
Visual Alert Layout: 5-Tier High-Intensity Red LEDs
Flexible Gooseneck Length: 18 Inches
Power Source Requirements: 4 x AAA Alkaline Battery Cells (Included)
Automated Safety Shut-Off: Yes, Triggers After 10 Minutes Inactive
Interface Monitoring Type: Digital LED Bar Indicator Matrix
Total Extended Tool Length: 28.31 Inches
Chassis Component Width: 1.78 Inches
Chassis Component Height: 2.75 Inches
Net Diagnostic Weight: 13.0 oz.
Pro-Tip: Always power on the sniffer in a known clean atmospheric area away from the suspected pipeline junction; this ensures the auto-calibration cycle maps a genuine zero reference baseline to maintain sensor accuracy.