Precise Digital Angle Measurement Built for the Field
The SitePro 26-DT205 is a compact, professional-grade digital theodolite engineered for surveyors, site engineers, and layout contractors who demand fast and repeatable angular readings without the guesswork of optical verniers or manual scale interpolation. With 5-second angular resolution and a bright LCD display, the DT205 eliminates parallax error and misread risk — two of the most common sources of costly rework on boundary surveys, building corner layouts, and complex angle-dependent site calculations.
Overview and Jobsite Applications
Whether you are establishing property corners on a residential subdivision, setting column lines for a structural steel erection, or performing alignment checks on industrial equipment, the DT205 delivers the angular precision professional work demands. The dual-face measurement capability allows you to cancel out instrument errors and confirm readings from both telescope positions — a standard practice for any survey-grade work. The compact, lightweight body fits comfortably on a standard 5/8-11 tribrach or instrument tripod, and the sealed housing holds up to typical outdoor site conditions including dust and light moisture exposure.
Key Specifications
- Angular accuracy: 5 seconds (0.0014°)
- Telescope magnification: 30x
- Objective lens aperture: 45 mm
- Minimum focus distance: approximately 1.0 m (3.3 ft)
- Display: dual-face LCD with backlight for low-light operation
- Measurement modes: horizontal (right/left) and vertical angles
- Horizontal circle setting: electronic zero-set and hold function
- Compensator: single-axis liquid compensator
- Leveling: 4-screw leveling base with circular and plate bubble
- Battery: AA alkaline batteries, approximately 50 hours continuous use
- Tribrach mount: standard 5/8-11 thread compatible
- Operating temperature: -20°C to +50°C (-4°F to +122°F)
- Weight: approximately 4.4 kg (9.7 lb) with tribrach
Key Features
- 5-second digital readout eliminates manual vernier interpolation and parallax error
- Dual-face (face-left/face-right) operation for instrument error cancellation on critical survey work
- Electronic horizontal zero-set and angle hold for fast reference direction resets
- Backlit LCD display for early morning, late afternoon, and shaded site conditions
- 30x magnification telescope with cross-hair reticle for precise target bisection at distance
- Single-axis compensator automatically corrects vertical angle readings for minor leveling errors
- Compact, balanced body reduces tripod setup fatigue over long observation sessions
- Compatible with standard 5/8-11 tribrachs, optical plummets, and surveying tripods
- Intuitive keypad layout minimizes operator training time on site
Job Applications
Property Boundary Verification: The 5-second resolution meets the angular tolerance requirements for most residential and light commercial boundary surveys. Use the DT205 to turn precise deflection angles along traverse legs, verify recorded bearing calls, and establish corner monuments with confidence.
Building and Structure Layout: Set column grid lines, verify building square on large foundations, and establish offset reference points using the horizontal angle lock and zero-set functions. The 30x telescope allows precise target bisection at the distances typical of commercial building footprints.
Slope and Grade Angle Measurement: Read vertical angles directly from the digital display to calculate percent grade, slope distance corrections, or elevation differences using trigonometric leveling — a fast alternative to leveling instruments on rough terrain traverses.
Equipment and Structural Alignment: Industrial maintenance and millwright crews use theodolites like the DT205 to align conveyor systems, check plumb on towers and columns, and establish precision reference lines across large process facilities where tape measure methods fall short.
Compatible Accessories
- Aluminum Surveying Tripod with Adjustable Legs
- 5/8-11 Optical Plummet Tribrach
- Prism Pole with Circular Bubble
- Surveying Prism and Holder Assembly
- Padded Instrument Carrying Case
- Sunshade for DT Series Theodolites
Related Guides
- How to Set Up and Level a Digital Theodolite on Site
- Theodolite vs. Total Station: Choosing the Right Instrument for Your Work
- Reading Horizontal and Vertical Angles with a Digital Theodolite
- Using Dual-Face Observations to Eliminate Instrument Error
Frequently Asked Questions
- What does 5-second accuracy mean for practical field work?
- Five arc-seconds (5") is the angular resolution the instrument can display and measure to. At 100 meters, 5 seconds of arc corresponds to approximately 2.4 mm of lateral displacement — well within tolerance for most residential surveys, building layout, and alignment tasks. For geodetic control or high-order boundary work, a 1-second instrument may be specified, but the DT205 satisfies the large majority of contractor and engineering survey applications.
- Can the SitePro DT205 be used with a total station tribrach?
- Yes. The DT205 uses a standard 5/8-11 leveling base that is compatible with most surveying tribrachs, including optical plummet tribrachs commonly paired with total stations and levels. This allows you to swap instruments on the same setup when a project requires both angle-only and distance measurement workflows.
- Does the DT205 measure distances?
- No. The DT205 is a pure angle-measuring instrument and does not include an EDM (electronic distance measurement) module. For combined angle and distance measurement in a single instrument, consider a total station. The DT205 is best paired with a prism pole, tape, or separate distance meter when slope or horizontal distances are also required.
- How long do the batteries last and what type does it use?
- The DT205 operates on standard AA alkaline batteries with an estimated service life of approximately 50 hours of continuous use — enough for weeks of typical intermittent fieldwork before replacement is needed. AA batteries are available anywhere, making it easy to keep spares on any jobsite without specialty charging equipment.
Frequently Asked Questions
What does 5-second accuracy mean for practical field work?
Five arc-seconds (5") is the angular resolution the instrument can display and measure to. At 100 meters, 5 seconds of arc corresponds to approximately 2.4 mm of lateral displacement — well within tolerance for most residential surveys, building layout, and alignment tasks. For geodetic control or high-order boundary work, a 1-second instrument may be specified, but the DT205 satisfies the large majority of contractor and engineering survey applications.
Can the SitePro DT205 be used with a total station tribrach?
Yes. The DT205 uses a standard 5/8-11 leveling base that is compatible with most surveying tribrachs, including optical plummet tribrachs commonly paired with total stations and levels. This allows you to swap instruments on the same setup when a project requires both angle-only and distance measurement workflows.
Does the DT205 measure distances?
No. The DT205 is a pure angle-measuring instrument and does not include an EDM (electronic distance measurement) module. For combined angle and distance measurement in a single instrument, consider a total station. The DT205 is best paired with a prism pole, tape, or separate distance meter when slope or horizontal distances are also required.
How long do the batteries last and what type does it use?
The DT205 operates on standard AA alkaline batteries with an estimated service life of approximately 50 hours of continuous use — enough for weeks of typical intermittent fieldwork before replacement is needed. AA batteries are available anywhere, making it easy to keep spares on any jobsite without specialty charging equipment.