The short answer
A theodolite measures horizontal and vertical angles and nothing else. A total station is an electronic theodolite with a distance meter and a small computer built in, so it measures angles and distances and turns them into coordinates. If your work is setting out lines, squaring corners and plumbing columns from known points, a theodolite does the job for a fraction of the price. If you need to locate points, stake out from coordinates or measure distances you cannot tape, you need a total station.
On eBay US, sampled 3 Oct 2026, used digital theodolites were asking $200 to $2,150 with a median of $640, and optical theodolites $115 to $1,100 with a median of $361. A used manual total station asks $1,200 to $7,500, according to the used total station price guide. New, entry digital theodolites start around $1,550 and the cheapest manual total station we found was $5,796.
On eBay now
Side by side
| Theodolite | Total station | |
|---|---|---|
| Measures | Horizontal and vertical angles | Horizontal and vertical angles, plus slope distance |
| Gives you | Angles. You compute positions yourself or set out lines on site | Distances, heights and coordinates on the instrument |
| Typical angle accuracy, new | 2 to 10 seconds | 1 to 7 seconds |
| Distance | None, apart from rough stadia readings off a rod | About 1 to 3 mm plus 1.5 to 2 parts per million, to a prism or a bare surface |
| Data | Read off the display and written down | Stored on board or in a data collector |
| Used, eBay US, 3 Oct 2026 | $115 to $2,150 | $1,200 to $7,500 asking for manual models |
| New, US dealers, 3 Oct 2026 | About $1,550 to $6,000 | About $5,800 to $11,700 for manual models |
A new 5-second digital theodolite and a new 5-second total station quote the same angle accuracy. What the extra money buys is the distance meter and the computer.
What a theodolite is
A theodolite is a telescope that turns on two axes, with a precise circle on each, so you can read the horizontal angle between two sightings and the vertical angle up or down to a target.
Optical theodolites read glass circles through a magnifier inside the instrument. Digital theodolites read the circles with an encoder and show the angles on a display; most current ones also have a tilt sensor that corrects small levelling errors, typically within 3 minutes of arc. Many digital theodolites still have stadia hairs in the telescope, so you can read a rough distance off a levelling rod.
Two names cause confusion on eBay. A builder's "transit" or "level-transit", such as a David White LT8-300, reads angles on external metal scales with a vernier and is a cheaper, less precise tool, not a theodolite. And sellers regularly list total stations as theodolites and the other way round. If the listing shows a distance key or an EDM spec, it is a total station.
Theodolites are still made. Topcon's DT-300 series has a brochure dated September 2025, Sokkia's DT550, DT750 and DT950 have replaced its older DT540 line, and Nikon's NE-100 series and GeoMax's Zipp02 are still sold by US dealers. We could not find a current Leica survey or construction theodolite; its theodolite today is an industrial model.
What a total station is
A total station is an electronic theodolite with an electronic distance meter (EDM) and an onboard computer. The EDM sends out infrared or laser light, times or phase-compares the return, and works out the slope distance. With the angles and the distance, the instrument computes horizontal distance, height difference and coordinates, and runs programs such as stake-out, resection and area.
The idea is older than most people think. Zeiss's Reg Elta 14 of 1968 recorded angles and distances on punched paper tape, and Hewlett-Packard sold its 3810A as a "Total Station" from 1975, which is where the name comes from.
A robotic total station adds motors and prism tracking so one person can run it. That is a separate decision, covered in robotic vs manual total station.
Reflectorless total stations
A reflectorless (prismless) total station can measure to a wall, a kerb or a rock face without anyone holding a prism there. It needs a stronger laser pulse to get a usable return from a bare surface.
Manufacturers quote reflectorless range to a 90% reflective grey card in moderate light: 500 m for a Leica R500 or Topcon GM-50, 800 m for a Sokkia iM-100 or Trimble C5, and 1,000 m for a Leica R1000. Dark, wet or angled surfaces give much less. Leica quotes about 200 m on an 18% grey card for the R500.
Accuracy is a little worse than to a prism. Leica rates its FlexLine instruments at 1 mm + 1.5 ppm to a prism in its precise mode and 2 mm + 2 ppm reflectorless out to 500 m. Topcon and Sokkia rate 1.5 mm + 2 ppm to a prism and 2 mm + 2 ppm reflectorless, but only over 0.3 to 200 m.
Most reflectorless EDMs are Class 3R lasers, so do not look into the beam or point it at people. Trimble's C5 is Class 1 in both modes.
The beam is not a point. Leica's dot is about 7 by 10 mm at 30 m; Trimble's C5 spreads to about 60 mm at 30 m. When part of the spot falls on a nearer or farther surface, the distance blends the two. A University of Southern Queensland study found a spread of about 28 mm shooting into a corner at 50 m. Shoot flat faces square-on, take two points on each wall and intersect them for corners, and watch for traffic or branches crossing the beam.
How accurate each one is
Angle accuracy is quoted in seconds of arc to ISO 17123-3. Current instruments come in 1, 2, 3, 5, 7, 9 and 10-second classes. Construction theodolites are mostly 5 to 10 seconds; survey total stations are mostly 1 to 5.
The number is a standard deviation for a direction measured in both faces, not a guarantee for every angle. A manufacturers' association explainer of the older DIN 18723 standard puts it this way: a 5-second instrument gives an angle to about 7 seconds when you read each pointing once in each face, and about 10 seconds if you only read face one.
What that means on the ground: 5 seconds of angle is about 2.4 mm sideways at 100 m, and 1 second is about 0.5 mm. For layout inside a building lot, a 5-second theodolite is plenty. For control surveys, boundary work and long sights, it is the total station's distance accuracy and data handling that matter more than the extra angle precision.
Distance accuracy is quoted as millimetres plus parts per million of the distance. At 1.5 mm + 2 ppm, a 200 m shot is good to about 1.9 mm.
Where the errors come from
Both instruments share the same mechanical errors:
- Line-of-sight (collimation) error: the telescope is not quite square to the axis it tips on. It shifts horizontal angles.
- Vertical index error: the zero of the vertical circle is off, so every vertical angle is out by the same amount.
- Tilting-axis (trunnion) error: the axis the telescope tips on is not square to the vertical axis. It barely matters on level sights and grows on steep ones.
Reading each target in both faces (face left and face right, flipping the telescope between them) and averaging cancels collimation and tilting-axis error. It does not cancel a badly levelled instrument, so check the plate bubble at every setup. Caltrans asks crews to check vertical index and collimation on total stations every day.
Set-up errors are on you: an instrument not centred over the mark, a loose tribrach, a tripod sinking in the sun.
Total stations add distance errors. Each 1.8 °F of temperature you have not entered into the instrument adds about 1 ppm to every distance, according to Caltrans. A wrong prism constant shifts every prism distance by the same amount; constants vary by prism, and -30 mm is common, so match the setting to the prism on the pole. Reflectorless shots add the edge and angle problems above.
When a theodolite is still the right buy
- Construction layout and alignment. Topcon pitches its laser-pointer DT-300L for setting anchor bolts on a line, sighting in footings and frames, and tilt-up walls. Plumbing a column or a building corner is a theodolite job.
- Industrial alignment. High-end industrial theodolites, at 0.5 seconds, are still used to align satellites and aircraft systems.
- Teaching. Surveying lab courses still run theodolite exercises for measuring horizontal and vertical angles.
- Weather balloons. The US Weather Bureau began tracking pilot balloons with optical theodolites in 1909, and pilot-balloon theodolites are still made.
- Budget and simplicity. Most used builder's theodolites ask $470 to $860. There is no EDM to fail, no software licence and less to calibrate. Published shop prices reflect that: eGPS Solutions in Georgia charges $166.25 to clean and calibrate a theodolite against $350 for a total station.
If you already own a total station, you do not need a theodolite. A total station measures angles like any theodolite; you simply do not use the distance meter.
GNSS vs total station
GNSS (RTK GPS) gives you coordinates without line of sight between two points, which makes it fast on open sites. Trimble's R12i is rated at 8 mm + 1 ppm horizontally and 15 mm + 1 ppm vertically in RTK.
A total station wins on vertical accuracy, under trees, next to buildings and indoors, where satellite signals are blocked or bounce. Natural Resources Canada's RTK guidelines say partly blocked sky can make RTK unsuitable. Caltrans's machine-guidance guidelines allow GNSS for rough grading but require total stations for final grade, at 0.05 ft horizontal and 0.02 ft vertical. Many crews carry both.
What they cost used
| Instrument | Used asking, US, 3 Oct 2026 | Median | Listings |
|---|---|---|---|
| Digital theodolites, all | $200 to $2,150 | $640 | 94 |
| Sokkia DT series | $300 to $1,400 | $645 | 22 |
| Nikon NE-100 series | $350 to $2,150 | $925 | 10 |
| Topcon DT-200 series | $461 to $990 | $800 | 7 |
| Spectra Precision DET-2 | $450 to $869 | $699 | 7 |
| Optical theodolites | $115 to $1,100 | $361 | 20 |
| Manual total stations, for comparison | $1,200 to $7,500 | see guide |
Item price without shipping, US sellers, used condition. Asking prices sampled through eBay search on 3 Oct 2026; most are Best Offer. Excluded: total stations and level-transits listed as theodolites, bundles with tripods and rods, untested units, units with dead batteries and live auctions. Total station figures are from our 28 Sep price guide; actual September sale prices are in the October 2026 used total station price report.
New, for comparison, on 3 Oct 2026: GeoMax Zipp02 2-second $1,620, Spectra Precision DET-2 $1,556.80, SitePro DT-205 $1,615, Topcon DT-309 9-second $3,112.12, Sokkia DT550 5-second $4,395, Topcon DT-305 5-second $4,999.99. Manual total stations: Topcon GM-55 $5,796, Nikon N 5-second $6,099.99, Leica TS03 $9,345 list, Sokkia iM-105 $10,700, Leica TS07 $11,695 list.
The middle half of used digital theodolites asked $470 to $860, roughly a third to a half of the cheapest new ones. Most of the market is 5 to 10-second Topcon, Sokkia, Nikon, Spectra and David White units, which is the right class for layout.
What to check on a used theodolite
- It powers up and holds a charge. Several listings in our sample were excluded for batteries that would not charge or missing battery packs. Ask how long it ran on its own battery.
- Readings change smoothly. Turn each axis slowly through a full circle. The display should count without jumps, freezes or error codes.
- Vertical index. Sight a target in face left, flip the telescope, sight it in face right. The two zenith readings should add up to 360°. Half the difference from 360° is the index error.
- Collimation. Do the same on a horizontal target. The two horizontal readings should differ by exactly 180°. Half the difference from 180° is the collimation error.
- Level and plummet. Level it, then turn it 180°. The plate bubble should stay centred, and the optical or laser plummet should stay on the mark as you rotate.
- Optics. Look for haze, fungus or scratches in the telescope and a crosshair that is sharp and square.
- What is in the box. Tribrach, tripod and charger are often missing and add cost.
- It is what it says. No distance key or EDM spec on a "theodolite", and no vernier scale on a "digital theodolite".
A "calibrated" claim means little without a certificate and a date; see what "out of cal" actually means. Buy from sellers who accept returns.
FAQ
Can a total station be used as a theodolite?
Yes. A total station measures horizontal and vertical angles exactly as a theodolite does; you simply do not use the distance meter. If you already own a total station, there is no reason to buy a theodolite unless you want a lighter, cheaper instrument for layout.
Is a transit the same as a theodolite?
Not in US trade usage. A builder's transit or level-transit reads angles on external metal scales with a vernier and is less precise. A theodolite reads enclosed glass circles, optically or electronically, to seconds of arc. In surveying textbooks, "transiting" also means flipping the telescope over, which every theodolite can do.
How accurate is a total station?
Current manual total stations are rated at 1 to 5 seconds of angle and about 1 to 3 mm plus 1.5 to 2 parts per million for distance. A 5-second instrument is about 2.4 mm sideways at 100 m. Real-world accuracy depends on setup, two-face measurement, the atmospheric correction and the prism constant.
Do I need a reflectorless total station?
Only if you need to measure points nobody can stand on with a prism: building faces, across traffic or rivers, or inaccessible structures. Reflectorless range is quoted to a 90% grey card, so expect less on dark or angled surfaces. Most current total stations include reflectorless EDM anyway.
Is a theodolite still worth buying?
For construction layout, alignment and teaching, yes. Most used 5 to 10-second digital theodolites ask $470 to $860 on eBay, against about $1,550 or more new. A theodolite has no distance meter to fail and is cheaper to service. If you need distances or coordinates, buy a used total station instead.
