testo 513 - Gas Leak Detector with Flexible Probe
Locate gas leaks quickly and keep your service work moving with the testo 513 gas leak detector. Designed for checks on domestic and industrial gas boilers and similar systems, it combines rapid response with a flexible probe that helps you reach awkward connections and confined spaces.
Clear readings and straightforward controls help you follow a suspected leak to its source, so you can spend less time searching and get on with the repair.
Request a quote for the testo 513 or contact our team to discuss your application.

testo 513 Key Features:
- Broad gas detection: identifies methane, propane, butane and hydrogen, including forming gas.
- Fast feedback: response and recovery times under two seconds support efficient checks.
- Flexible access: a robust gooseneck helps you investigate difficult-to-reach areas.
- Precise localisation: automatic and manual zeroing help narrow down the leak source.
- Clear alerts: numeric and bar-graph displays work alongside visual and audible alarms.
Why choose the testo 513?
For heating and gas service engineers, the testo 513 brings the essentials together in one compact instrument. Its flexible probe helps you work around obstructions, while selectable displays let you follow readings in the format you prefer.
The user-replaceable sensor also makes ongoing maintenance more practical, helping reduce downtime and keep operating costs manageable.
What Comes with the testo 513?
- testo 513 Detector
- Gas sensor
- Bag
- Batteries
- Protection Cap
Specifications:
| Specification | Detail |
| Product code | 0563 0513 |
| Gas detection range | 1 ppm to 1.0 vol.% |
| Response and recovery time | Under 2 seconds |
| Probe length, including sensor | 330 mm |
| Power and battery life | 3 × AA alkaline batteries; 10 hours |
| Operating temperature | -10 to +50°C |
❓ Frequently Asked Questions (FAQ)
Q1: Can the testo 513 detect hydrogen leaks?
A. Yes. It detects hydrogen, including forming gas applications, as well as methane, propane and butane.
Q2: Does it display gas concentration?
A. Yes. It supports readings in ppm, vol.% and %LEL, with numeric and bar-graph display options.
Q3: Can I replace the gas sensor myself?
A. Yes. The gas sensor is user-replaceable, allowing you to maintain the detector without replacing the complete instrument.