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DL 502 - 503

World's First "Wave-and-Read" Technology

Topcon DL-500 series digital levels maximize work efficiency and minimize human error, providing consistent measurement precision and speed, regardless of operator skill.

Incorporating cutting-edge Random-Bidirectional (RAB) coding technology, an optimized digital processing algorithm, the DL-500 provides exceptional measurement accuracy,

stability and speed, under a variety of environmental conditions. Even when the staff surface is partially shaded, or in dim lighting conditions as low as 20 lux, a single button triggers measurement and the DL-500 instantly provides reliable results.

The world's first "Wave-and-Read" technology provides an additional survey style option that allows a rod operator to wave the staff forward and back, instead of keeping the staff plumb. This simpler method is faster, easier, minimizes the fatigue and is just as accurate.

Pre-installed measurement programs assist various leveling tasks and accompanied calculations. Internal memory stores field data, and can be directly transferred to your computer via serial cable, eliminating human error.


Calculates elevation of foresight (FS) with reference to backsight (BS) elevation. Elevation of the turning point (TP) is used for a new backsight, allowing for consecutive leveling.

Cut and Fill

Cut and fill stakeout routines facilitate slope work. Measurement can be taken with 0.1mm or 1mm (0.001ft. or 0.01ft.) resolutions.

Height Difference

Automatically displays the height difference between backsight (BS) and foresight (FS) in 0.1mm or 1mm (0.001ft. or 0.01ft.) unit.

Ceiling Height

Two measurements provide a ceiling height; one with a staff placed on the ground, the other with an inverted staff put onto the ceiling. Ceiling elevation can also be calculated with reference to the benchmark elevation.

Technical Specifications

Telescope DL-502 DL-503
Magnification 32X 28X
Objective aperture 45mm (1.78in.) 36mm (1.42in.)
Resolving power 3” 3.5”
Field of view 1°20” 1°20”
Minimum focus 5.0ft. (1.5m) 5.0ft. (1.5m)
Image Erect Erect
Stadia ratio 100 100
Compensator DL-502 DL-503
Type Pendulum compensator with magnetic damping system
Working range ±15’ ±15’
Height Measurement DL-502 DL-503
Accuracy (standard deviation for 1km double run leveling)
Electronic reading
Invar staff 0.6mm 0.8mm
Fiberglass staff 1.0mm 1.5mm
Optional reading 1.0mm 2.0mm
Measuring range 5.3 to 328ft. (1.6 to 100m)
Measuring time
Fine 3 sec. (single/continuous/average)
Tracking 1 sec. 1 sec.
Least count 0.0001/0.001m, 0.001/0.01ft., 1/8in.
Minimum brightness condition 20lx. at the staff surface
Distance Measurement (D=measuring distance) DL-502 DL-503
D 10m ±0.4in. (±10mm) ±0.4in. (±10mm)
10m<D 50m ±0.1%×D ±0.1%×D
50m<D ±0.2%×D ±0.2%×D
Least count 0.01/0.1m, 0.1/1ft., 1in. 0.01/0.1m, 0.1/1ft., 1in.
User Interface DL-502 DL-503
Display 128×32 dot matrix LCD with backlight
Keyboard 8 keys (7 on front panel, 1 on side panel)
Circular level sensitivity 10’/2mm 10’/2mm
Measurement Program DL-502 DL-503
Single / Continuous / Average / Elevation / Height difference / Cut & Fill / Stakeout distance
Data Storage DL-502 DL-503
Internal memory 2,000 points 2,000 points
Job Max. 20 jobs Max. 20 jobs
Data output format CSV CSV
Interface RS-232C RS-232C
Environmental DL-502 DL-503
Water resistance IPX4 (IEC 60529:2001)
Operating temperature -4°F to 122°F (-20°C to 50°C)
Storage temperature -40°F to 158°F (-40°C to 70°C)
Others DL-502 DL-503
Power supply BDC46B (Li-ion battery, 7.2V)
Operating time Approx. 16 hours Approx. 16 hours
Weight (including battery) 5.3lb. (2.4kg)
Size (D x W x H) 10.1×6.2×7.2in. (257×158×182mm)

For more details download brochure:



Hardware Platform
Operating System Windows CE 5.0, Windows Mobile 6.1 or higher
Graphics 320 x 240 min resolution w / H in pixels, 640 x 480 alt resolution w / h in pixels
RAM 28 min Mb
Disk Space 64 min free in Mb, flash (internal) type

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