Survey rods, range poles and survey markers: types and how to use them

What is a survey rod?

A survey rod, also called a levelling rod, levelling staff or surveyors rod, is a straight graduated staff held vertically on a point while a level reads where its horizontal line of sight crosses the graduations. The reading is the vertical distance from the line of sight down to the point, so the difference between two readings is the height difference between two points.

Rods are used with automatic levels, digital levels, transit levels and rotating lasers. If you are still choosing the instrument, our guide to the types of levels in surveying explains which rod each type needs. Tripods, prisms and GNSS poles are covered separately in our survey tripod, tribrach and prism guide; this article focuses on rods, range poles and the marks you leave in the ground.

What types of survey rods are there?

The main survey rod types are telescopic levelling rods for general work, precise invar staffs, bar-code staffs for digital levels, and grade rods for lasers and construction. They differ in material, graduation and the accuracy they support.

Materials matter: aluminium is light and cheap but conducts electricity, so never raise it near overhead power lines; fibreglass is non-conductive and weather-resistant; invar has almost no thermal expansion for precise work.

How do you hold and read a surveyors rod correctly?

Hold the rod plumb on a firm, well-defined point, with every section fully extended and locked, and read the value at the horizontal crosshair. A tilted rod always reads too high, so most errors come from the rodperson, not the instrument.

• Use a rod level. A circular bubble clamped to the rod shows plumb in two directions. Without one, rock the rod slowly toward and away from the instrument and let the observer take the lowest reading.
• Check the sections. Make sure each section clicks fully into place; a partly extended section shifts every upper reading.
• Keep the base clean. Mud or a worn shoe changes the zero. On soft ground, use a change plate or a solid stake for turning points.
• Read the right scale. Confirm whether the face is metric or feet and tenths before the job starts.
• Avoid low sights. Readings near the ground suffer from heat shimmer and refraction on hot days; keep sights balanced and reasonably short.

Our engineers' tip: at the end of every level run, close back onto the starting benchmark. A misclosure of more than a few millimetres on a short loop usually points to a rod not held plumb or a moved turning point.

What is a grade rod and how is it used for construction staking?

A grade rod is a survey rod with a sliding scale or tape and a clamp for a laser detector, set so it reads cut or fill relative to the design grade directly. It is the everyday tool for construction staking and checking grades with a rotating laser.

1. Set the laser on a tripod at a convenient height and let it self-level.
2. Stand the rod on a benchmark and slide the detector until it beeps on grade with the beam.
3. Offset for the design. Move the tape or detector by the difference between the benchmark height and the design grade, so the detector is on beam when the rod foot is at finished level.
4. Check points across the site. If the detector reads above grade, the ground is high (cut); below grade, the ground is low (fill).
5. Mark stakes with the cut or fill, station and offset, and re-check the benchmark at the end.

On larger sites, GNSS rovers and total stations now do most survey staking and layout. Our construction stakeout and layout guide explains those workflows.

What is a range pole used for?

A range pole is a straight pole, usually about 2 m long and painted in alternating red and white bands, used to mark points so they can be seen from a distance, to line up straight lines and to act as a sighting target. It is not used to measure heights.

Range poles help with ranging out a line between two distant points, marking a station for a theodolite or compass sight, and showing a point's position for photographs or drone flights. They should not be confused with GNSS rover poles, which carry a 5/8"-11 thread for the receiver and are measured to an exact height. For telescopic receiver poles, our GNSS RTK accessory kit includes a 1.8 m or 2.6 m telescopic pole together with a tripod, brackets, holder and carry bag. To hold any pole steady and plumb for longer check measurements, add a GNSS pole bipod with a quick-lock clamp and steel-pointed feet.

What are survey stakes, hubs and lath used for in survey staking?

Survey stakes are wooden or plastic markers driven into the ground to show contractors where to build and how deep to dig. In survey staking, lath carry the written information, hubs mark the exact point, and guard stakes protect and identify the hub.

• Lath – thin wooden stakes with flagging, written with point number, station, offset and cut or fill.
• Hubs – short, square wooden stakes driven nearly flush, often with a tack or nail marking the exact point.
• Offset stakes – set a fixed distance from the true point so they survive excavation.
• Slope stakes – mark where a cut or fill slope meets natural ground.
• Grade stakes – often with a painted top (sometimes called blue tops in US practice) set to finished grade.
• Nails and paint – masonry or survey nails and spray marks for points on paved surfaces.

Agree a clear marking convention with the contractor before work starts: which direction offsets run, whether cut and fill refer to the top of stake or ground, and the units. Colour codes for flagging vary between clients and countries.

What are concrete survey markers and other survey monuments?

Survey monuments are permanent marks that record control points, benchmarks or property corners so they can be found and reused for decades. Concrete survey markers, iron pins and brass or aluminium disks are the most common types.

Concrete property markers are common for boundaries in many countries because they are hard to move and easy to find. Use concrete survey markers set below frost depth where ground freezes, and record a sketch, photographs and ties to nearby features so the next surveyor can recover the mark.

Can you move or replace survey markers?

No. In many jurisdictions it is an offence to remove, move or damage a survey monument, and only a licensed surveyor may set or reset boundary markers. If a marker is in the way of construction, ask the surveyor to reference it before work and reset it afterwards.

Property owners trying to locate their corners should read our guide on how to find property lines with GPS, which explains what consumer GPS can and cannot tell you and when a licensed survey is required.

How to choose survey equipment accessories for levelling and staking

Choose rods and markers by the instrument you use, the units your clients work in and how long the marks must last. A practical starter kit for a small crew looks like this:

• A 5 m metric or 25 ft US-unit telescopic rod with a rod level, plus a bar-code staff if you use a digital level.
• A grade rod with a laser detector clamp for construction staking.
• Two range poles for alignment and sighting.
• Lath, hubs, flagging, nails, marking paint and a supply of iron pins or concrete markers.
• A rigid tripod for the level, such as our aluminium survey tripod with a 5/8"-11 head, 90–158 cm height range and pointed steel feet.

Browse our full range of survey accessories, or request a quote for tripods, poles and bipods to complete your kit.

Frequently asked questions