Autool LM55 | HVAC Temperature Clamp | Accessories
Warranty handled directly by AsTools
Warranty handled directly by AsTools
We handle warranty cases ourselves, quickly and without the intervention of the manufacturer. Thanks to our own parts inventory and technical expertise, we can usually help you immediately. Only in exceptional cases do we still send the product to the supplier.
2 years warranty on all products
2 years warranty on all products
All our products come with a 2-year factory warranty. This way, you are assured of long-lasting quality and service.
Easy returns via Returnless
Easy returns via Returnless
Returns are easy via Returnless. Register your return online and choose your own shipping method. Return costs are at your own expense.
Professional customer service
Professional customer service
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The Autool LM55 is a digital temperature clamp specifically designed for measurements on HVAC systems (heating, ventilation, and air conditioning). This clamp measures the surface temperature of pipes with a diameter of 6 mm to 38 mm. The measurements are displayed on an integrated OLED screen. The LM55 functions as an accessory and wirelessly transmits measurement data via Bluetooth 5.0 to compatible Autool digital manometers, such as the LM120+ series.
The functionality of this temperature clamp is focused on collecting data for the analysis of cooling systems. By combining the temperature data with the pressure data from a manometer, the degree of superheat (overheating) and subcooling (undercooling) can be calculated. The clamp is equipped with a magnetic hook on the back, allowing it to be attached handsfree to metal surfaces. A built-in alarm function warns when the measured temperature exceeds a preset value.
Application and functionality:
The Autool LM55 is used for accurate and contactless measurement of the surface temperature of pipes in cooling and heating systems.
- Wireless Data Transmission: The clamp connects via Bluetooth 5.0 to a compatible digital manometer, allowing temperature data to be read remotely within a range of up to 30 meters.
- Superheat and Subcooling Analysis: In combination with a manometer, the LM55 provides the temperature data needed to calculate superheating and subcooling of the refrigerant.
- Real-time Display: The integrated OLED screen directly shows the measured temperature, battery status, and Bluetooth connection signal strength.
- Flexible Mounting: The clamp has an opening range for pipes from 6 mm to 38 mm and is equipped with a magnetic hook for easy positioning.
- Temperature Alarm: An adjustable alarm function signals when the temperature passes a set upper or lower limit.
Package Contents:
- 1x Autool LM55 HVAC Temperature Clamp
- 1x Storage Case
- 1x Manual
Technical specifications:
| Specification | Description |
|---|---|
| Brand | Autool |
| Model | LM55 |
| Product Type | HVAC Temperature Clamp |
| Temperature Range | -40℃ to 150℃ (-40℉ to 302℉) |
| Accuracy | ±1℃ (±1.8℉) |
| Resolution | 0.1℃ / 0.1℉ |
| Clamping Range | 6 mm to 38 mm |
| Wireless Connection | Bluetooth 5.0 |
| Wireless Range | 30 meters (in open space) |
| Power Supply | 3x 1.5V AAA batteries |
| Screen | OLED |
| Operating Temperature | -10℃ to 50℃ |
| Storage Temperature | -20℃ to 60℃ |










