Read Both Pressure Sides and Calculate Superheat and Subcooling
The LM120 reads high- and low-side gauge pressure on one backlit display, monitors relative vacuum, runs a timed pressure-retention test and supports refrigerant charging. Pipe temperatures and SH/SC calculations need compatible clamp probes, which are included only in selected packages or bought separately.
- 0–6 MPa Gauge Pressure
- Dual Temperature Inputs
- Superheat / Subcooling
- Timed Pressure Retention
- 1/4-Inch Connections
Key Features
-
Dual Pressure and Temperature
Reads high- and low-side pressure together with two pipe temperatures during installation, testing and service.
-
Superheat and Subcooling
With the correct refrigerant selected and the probes fully seated on the pipes, the gauge calculates SH and SC from pressure and temperature data.
-
Vacuum Monitoring
Follow relative vacuum during an approved evacuation procedure before charging.
-
Timed Pressure-Retention Test
Shows initial pressure, current pressure, pressure difference (ΔP) and elapsed time to help assess system tightness.
-
Charging Assistance
Built-in refrigerant data gives direct operating readings to support the equipment-specific charging procedure.
-
Durable Controls
High-strength engineering plastic housing, non-slip silicone grip and long-life valve switches.
More Specifications
| Pressure type | Gauge pressure (referenced to atmosphere, not absolute) |
|---|---|
| Battery type | 1.5 V AA / LR6 |
| Refrigerant inlet | Middle port with a valve core for venting air from the hose |
How to Use
- Confirm refrigerant and ratingsIdentify the system refrigerant from reliable vehicle or equipment data and check the gauge, hose and system pressure limits.
- Inspect and zeroClose both valves, inspect hoses and fittings, power on, choose mode, units and refrigerant, and zero residual pressure if required.
- Connect by flow directionAttach the correct hose ends to the service ports according to the manual and system procedure.
- Run the required modeUse pressure/refrigerant mode, vacuum mode or the pressure-retention test; seat the temperature probes fully when SH/SC is needed.
- Close, verify and disconnectClose the valves in the required order, let high-side pressure fall to a safe point, review results and disconnect.
Setup, measurement and troubleshooting: LM120 user manual (PDF).
Good to Know
Caution
- Temperature probes and batteries may not be included; confirm your package configuration before ordering.
- The gauge does not identify refrigerant. Select the known refrigerant before interpreting readings or charging.
- The measuring span, instrument limit and hose ratings are separate values. Work to the lowest applicable working rating of system, gauge and hose, never to a limit figure.
- Do not remove the high-pressure connection until pressure has dropped to a safe point.
- A pressure-retention change can flag a sealing problem but does not locate the leak; use a separate approved method.
Care
- Replace damaged hoses, seals or fittings, and use a suitably rated hose if the supplied one does not meet the job.
- Keep the instrument dry and away from heat, humidity, flammable or explosive areas and strong electromagnetic fields.
- Do not modify the internal circuit.
- Replace the batteries when the low-battery sign appears.
English 
German 
Spanish 