Spirit Levels & Inclinometers

Spirit levels also known as bubble levels are invaluable tools for achieving precise levelling in a variety of tasks, from mounting shelves to ensuring bricks are evenly aligned in new walls. This handy device is user-friendly and provides a straightforward method for maintaining accuracy during any job. Spirit levels feature a liquid-filled vial containing an air bubble. The markings on the vial help users determine when the bubble is centred, indicating that the surface is level. Perfect for both DIY enthusiasts and professional tradespeople, spirit levels are a must-have for any toolbox.

For best results try to use the longest level that fits on the surface that is being checked on either the horizontal or vertical (plumb) planes. However, for precise industrial applications such as engineering or machinery setups where tolerances are tighter, a shorter, precision spirit level is recommended as they can be calibrated to a much higher sensitivity (often as fine as 0.02mm/m) over a smaller surface area.

An inclinometer sometimes known as clinometer is used for measuring the angles of slope or elevation, similar to a spirit level; they can use various methods to measure and can be both analogue and digital read outs. Most commonly featuring a gravity-based pendulum others can use a spirit vial.

Modern inclinometer spirit levels offer a digital alternative to traditional spirit levels. These devices utilise advanced MEMS accelerometers to provide a highly accurate reading, and are becoming increasingly popular across Australia due to their superior precision, reliability, and ability to store and document measurement data.

Professional Types of Spirit Levels

Across Australia, tradespeople and technicians select specific spirit levels based on the required tolerance of the project and the physical constraints of the workspace.

Engineering and Precision Spirit Levels

An engineering spirit level is a high-grade tool designed for the leveling of heavy machinery and laboratory equipment where standard construction tolerances are insufficient. Unlike a general-purpose bubble level, a precision spirit level features a finely graduated spirit level vial calibrated to sensitivities as high as 0.02mm/m.

Circular and Bullseye Levels

A circular spirit level, often referred to as a bullseye level, allows for a 360-degree check of a horizontal plane in a single glance. Because the spirit level bubble moves within a round face, it provides a quick reference for centering equipment without needing to rotate the tool.

Torpedo and Pocket Levels

Torpedo levels are compact, tapered tools designed for Australian plumbers and electricians who frequently work in tight cavities or overhead. These versions of the spirit levels typically feature a magnetic base for hands-free use on steel piping and include multiple vials to check 45-degree angles alongside standard plumb and level. Their small form factor makes them an essential "everyday carry" for quick trade checks where a full-length accurate bubble level would be impractical.

Digital and Electronic Levels

For projects requiring documented data or specific slopes, a digital inclinometer spirit level provides a numeric readout in degrees, millimetres per metre, or percentage of grade. These tools utilise electronic sensors to provide a precision bubble level experience that is easy to read in low-light conditions. They are particularly useful for ensuring ADA-compliant ramp gradients or drainage falls where a traditional bubble level might be open to human interpretation.

Understanding Spirit Level Vial Quality and Accuracy

The spirit level vial is the core functional component, consisting of a sealed, precision-ground barrel or curved tube that dictates the tool's sensitivity and repeatability. The accuracy of a spirit level is determined by the internal radius of the vial; a larger radius allows the spirit level bubble to react to even the slightest deviation, whereas poor-quality vials with irregular internal surfaces can lead to "sticky" bubbles and inconsistent readings.

In the intense Australian heat, high-quality vials use specialised liquids with low surface tension and high thermal stability to ensure the bubble remains responsive and does not suffer from static electricity interference that can cause it to "cling" to the side of the tube.

RS carries high-quality spirit levels with vials that are specifically engineered to be leak-proof and static-free, ideal for worksites in the harsh Australian weather.

Spirit Level Characteristics to Consider

When selecting a spirit level for professional use in Australia, several design factors dictate the tool's reliability and ease of use on the job.

Accuracy: Professional levels are rated by their maximum deviation in the standard position, typically ranging from a trade-standard +/- 0.5mm/m to an engineering spirit level standard of +/- 0.02mm/m.
Bubble Size: A larger spirit level bubble is easier to read. However, as the liquid in a spirit level vial can expand when hot, the bubble may contract in Australian temperatures. To resolve this, pick a vial that is UV-resistant.
Colour: Vials are filled with fluorescent liquid to enhance visibility. High-quality models use UV-stabilised pigments to ensure the liquid does not turn clear after prolonged exposure to the Australian sun.
Reading Lines: The graduations on the spirit level vial must be crisp, permanent, and perfectly aligned to ensure the user can identify the exact centre point without parallax error.
Frame Construction: For industrial environments, a die-cast aluminium frame with shock-absorbing rubber end caps provides the necessary durability to protect the delicate internal components from drops on concrete.
Magnetic Base and V-Grooves: An accurate bubble level featuring a V-groove is ideal for seating on curved conduit or pipework, while a magnetic base allows for hands-free alignment on steel beams and frames.

Who Uses Spirit Levels and Inclinometers?

Carpenters: Use a bubble level for framing, installing cabinetry, and ensuring deck joists have the correct fall for Australian drainage requirements.
Stonemasons: Depend on an accurate bubble level to set heavy stone blocks and benchtops, where even a slight error can lead to structural cracking.
Bricklayers: Frequently use long-format spirit levels to maintain "plumb" (vertical) accuracy across high-rise courses and "level" (horizontal) accuracy for even mortar beds.
Surveyors: Utilise a circular spirit level on tripods and high-precision digital tools to establish reference points across large-scale civil engineering sites.
Mechanical Engineers: Often require a precision spirit level or an engineering spirit level to calibrate CNC machines and ensure shafts are perfectly horizontal to prevent bearing failure.
Maintenance Technicians: Employ a precision bubble level to check for equipment settling over time, ensuring that conveyors and production lines in Australian factories remain within operational tolerances.

Why Do Some Spirit Levels Have Two Bubbles?

Many spirit levels feature a dual-vial system, typically one for horizontal levelling and one for vertical plumb checks, to allow tradespeople to verify two planes without rotating the tool.

High-end models may also include a third spirit level vial set at a fixed 45-degree angle or a secondary horizontal vial to provide a more accurate bubble level reading from different viewing heights. This redundancy ensures that the spirit level bubble is always within the user’s line of sight.

Measuring Angles with Inclinometers

While a standard bubble level is designed to find a perfect 0 or 90-degree reference, an inclinometer spirit level is utilised when a project requires a specific slope or pitch. This transition to angle measurement is vital for tasks like setting drainage falls or staircase stringers, where "level" is not the goal, but a precise degree of inclination is required.

Digital Inclinometers vs. Clinometers

The primary distinction between these tools lies in their internal sensors; a traditional clinometer often uses a weighted pendulum, whereas a digital inclinometer utilises electronic MEMS accelerometers. These modern electronic systems provide a high-resolution, accurate reading with instant digital readouts.

Maintenance and Calibration for Professional Spirit Levels

Regular maintenance ensures that your spirit level is aligned and reliable.

Clean the Surfaces: Always wipe down the base and the spirit level vial to remove grit or dried mortar that could compromise the tool's contact with the workpiece.
The 180-Degree Flip Test: To check for accuracy, place the level on a flat surface, note the spirit level bubble position, then rotate the tool 180 degrees horizontally; if the bubble does not settle in the exact same spot, the level requires recalibration.
Side-to-Side Verification: Ensure the level is not "bowed" by checking it against a known straight edge, as a warped frame will prevent a precision bubble level from giving a true reading.
Check for Static: If the bubble appears to "stick" or jump, wipe the vial with a damp cloth to discharge any static electricity that may have built up in dry Australian conditions.

Industrial Applications for Spirit Levels and Inclinometers

In the Australian industrial sector, the use of a precision spirit level or inclinometer is critical for safety and structural integrity across various high-stakes environments.

Roadwork and Paving: Contractors use an inclinometer spirit level to establish the correct camber on road surfaces, ensuring efficient water runoff and vehicle safety.
Drainage and Plumbing: An accurate bubble level is essential for setting the "fall" on pipework, ensuring that waste systems function via gravity without blockages.
Industrial Fabrication: During the assembly of large steel structures, an engineering spirit level is used to ensure that vertical columns are perfectly plumb before they are bolted or welded.
Machinery Installation: Technicians utilise a precision bubble level to seat heavy manufacturing equipment, preventing vibration and premature wear caused by uneven weight distribution.

Buy Spirit Levels and Inclinometers Online from RS

When precision is non-negotiable on Australian worksites, selecting a professional-grade bubble level or inclinometer spirit level from a trusted supplier is essential for long-term reliability. At RS, our extensive inventory of spirit levels includes industry-leading brands such as Stanley, Facom and SAM. Whether you require an engineering spirit level for high-tolerance machinery calibration or an accurate bubble level for general site work, our selection is curated to withstand the rigours of the Australian climate.

Besides spirit levels, we also carry a range of measuring tools such as laser levels, measuring wheels, as well as feeler gauges for various tasks. For more information about our convenient delivery options and fees, please visit our delivery information page.