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Prism Poles
The Short Answer
A prism pole is a graduated aluminum or carbon-fiber staff that holds a surveying prism at a precise, adjustable height above the ground point, letting a total station or theodolite measure horizontal distance and elevation to that point. Express Tools carries SitePro and Sokkia prism poles from mini 1.28-ft stakeout poles to 15-ft telescoping models, with twist-lock or compression-lock mechanisms and graduations in tenths and metric.
Total stations and theodolites measure to a retroreflective prism — the prism pole puts that prism exactly over the ground point at a known height. When the instrument operator enters the pole height (HI), the total station automatically accounts for it in every elevation and coordinate calculation, so the accuracy of your data starts with a well-made, accurately graduated pole.
Poles come in two main locking styles: twist-lock sections unscrew to release and re-lock quickly in the field; compression-lock (lever-clamp) poles lock each section independently and are faster to set when you run many short shots. Material options are aluminum for economy and light weight, and carbon fiber for stiffness and reduced sag at full extension — important on long-distance topo shots where even a few millimeters of flex in the pole translates to measurement error.
Most poles thread onto a standard 5/8-11 prism adapter at the top and end in a steel or carbide point at the bottom. Accessories like topo shoes (flat-base adapters) and bipods round out a field kit when traversing or holding a lot of points.
Prism Poles In Stock
Frequently Asked Questions
What length prism pole do I need?
For most topographic and construction surveying, an 8-ft or 2.6-m (8.5-ft) pole covers the common range of measurement heights. Taller poles (12 ft, 15 ft) add reach when shooting over vegetation, walls, or equipment, but longer extension increases flex — use a pole clamp or bipod to steady them. Mini poles (1.28 ft – 5.1 ft) are used for stakeout and detail work where full height is not needed.
Twist-lock vs compression-lock prism pole — which is better?
Both hold reliably when used correctly. Twist-lock poles are common and economical; you rotate the upper section until it locks against the lower. Compression-lock (lever-clamp) poles let each section lock independently, which speeds up height adjustments when you are setting many points. Neither is inherently more accurate — accuracy comes from reading the graduation precisely and entering the correct pole height.
What is a prism pole graduation — tenths or metric?
Most North American prism poles are graduated in decimal feet (tenths and hundredths), matching the decimal-feet coordinate systems used in U.S. engineering and construction. Metric-graduated poles read in meters and centimeters. Many SitePro poles are dual-grad, printing both scales on opposite sides of the pole so crews that work in either system can use the same pole.
What is a topo shoe and when do I use one?
A topo shoe is a flat-base adapter that replaces the pointed tip of a prism pole when measuring on hard surfaces — asphalt, concrete, or smooth rock — where the point would skid rather than seat. Wide-base topo shoes provide extra stability on flat terrain. Switch back to the point tip for soil, grass, and unpaved surfaces.
Will a SitePro prism pole fit my total station prism?
Yes — survey prisms and prism poles use the industry-standard 5/8-11 threaded connection. Any 5/8-11 prism from Topcon, Sokkia, Leica, or third-party brands mounts directly on a 5/8-11 pole. Adapters are available for poles or prisms with non-standard threads.
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