
Testo's 327-1 is an ideal entry-level flue gas analyser for gas professionals. Suitable for testing combustion efficiency, temperature, O2 (oxygen), CO2 (carbon dioxide), CO (carbon monoxide) and flue draught, the 327-1 gives the user a comprehensive snapshot of what's happening inside a boiler. Multiple parameters are shown simultaneously on the 4-line digital display to ensure all measurements are as accurate as possible (the display also has a built-in backlight for use in poor lighting).
With the 327-1, you can work faster and smarter. Testing configurations are simple - just use the navigation buttons and simple menu structure to quickly select the test you want. It's also designed for speed when measuring and will generate a completely stable measurement within 30 seconds.
Working in demanding applications where a tester might be easily damaged? The 327-1 comes with a 'second skin' - a protective casing which protects the analyser from impact damage.
Sensors and probes can be easily taken off and replaced as needed thanks to plug-and-play technology. Additional features also include a built-in condensation trap and fully rechargeable batteries.
PASS Presents the Combustion Analyser Showdown - Testo 300 vs Testo 327
| Model | 310 | 327-1 | 300 |
| Sensors | O2, CO | O2, CO | O2, CO |
| Measurement ranges | CO: 0-4000ppm, CO2: 0-CO2 Max | CO: 0-4000ppm, CO2: 0-CO2 Max | CO: 0-4000ppm, CO2: 0-CO2 Max |
| NO / NOx Measurements | ✖ | ✖ | Optional |
| Gas pressure testing | ✔ | ✔ | ✔ |
| Flow/return temperature measurement | ✖ | ✔ | ✔ |
| Draught measurement | Sepearate for Flue Gas measurement | Parallel to Flue Gas Measurement | Parallel to Flue Gas Measurement |
| O2 measurement (0 - 21%) | ✔ | ✔ | ✔ |
| Temperature measurement | (0 - 400°C) | (-40 - 600°C) | (-40 - 1200°C) |
| Instant ready standby mode | ✖ | ✖ | ✔ |
| Printer compatible | ✔ | ✔ | ✔ |
| Create & send reports directly (email/Bluetooth) | ✖ | ✖ | ✔ |
| Inbuilt Android device | ✖ | ✖ | ✔ |
| Software/app | ✖ | ✖ | Testo EasyHeat PC Software |
| Memory | ✖ | ✖ | 1 million measuring values |
| Display | 2-Line LCD Display | 4-Line LCD Display | 5" HD Colour Display |
| Touchscreen | ✖ | ✖ | ✔ |
| Sensor Warranty from Testo | 2 Years | 3 Years | 3 Years |
| Instrument Warranty from Testo | 2 Years | 2 Years | 2 Years |
| Testo 327-1 Standard Kit | Testo 327-1 Standard Kit & Leak Detector | Testo 327-1 Standard CPA1 Kit & Leak Detector | Testo 327-1 Advanced Kit | Testo 327-1 Advanced Kit & Leak Detector | Testo 327-1 Advanced CPA1 Kit & Leak Detector | |
| Testo 327-1 FGA | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
| Soft Carry Case | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
| 180mm Flue Gas Probe | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
| Mains Unit | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
| Differential Temperature Kit | - | - | - | ✔ | ✔ | ✔ |
| Differential Hose Kit | - | - | - | ✔ | ✔ | ✔ |
| Testo Label Printer | - | - | - | ✔ | ✔ | ✔ |
| Shoulder Strap | - | - | - | ✔ | ✔ | ✔ |
| 316-1 Gas Leak Detector | - | ✔ | ✔ | - | ✔ | ✔ |
| CPA1 Probe Set | - | - | ✔ | - | - | ✔ |
Free SelectaDNA Tool Marking Kit (Worth £50) with all Testo 310 (2nd Gen), 327 and 300+ Flue Gas Analyser kits. Offer available from 1st Sept to 31st Dec 2025. Terms & Conditions apply. Find out more about SelectaDNA kit.
Worth £29.99. Automatically adds to your basket when the total exceeds £500+ (ex VAT). Limited Stock. More details here.
| Temperature Measurement Range | -40 to 600°C |
| Draught Measurement | ±40hPa |
| Efficiency Measurement | 0 to 120% |
| Flue Gas Loss | 0 to 99.9% |
| Oxygen Measurement | 0 to 21% volume |
| CO2 Measurement | 0 to CO2 max |
| CO Measurement | 0 to 4000ppm |
| General Specifications | |
|---|---|
| Storage Temperature | -20 to 50°C |
| Operating Temperature | -5 to 45°C |
| Power Supply | Via Li-Ion rechargeable battery |
| Battery Life | More than 5 hours |
| Weight | Approx 500g |
| Dimensions | 216 x 68 x 47mm |
| Warranty | 2 years on instrument, probes and gas sensors 1 year on thermocouple and rechargeable battery (wearing parts excluded) |