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Universal Automatic Level Leica NAK2:

The NA2 universal automatic level meets all requirements regarding precision, convenience and reliability. It was designed by surveyors and development engineers with years of experience and who know what a field instrument

has to be able to do. The NA2 soon pays for itself, because it can be used for all types of surveying job; on building sites for routine levelling, in engineering projects, and for geodetic control at all levels of accuracy.


Universal application:


Levelling of all types and all orders of accuracy

Precise levelling and settlement determinations on buildings

Routine heighting for the construction of roads, railways, pipelines, tunnels and so forth

Setting-out work and control measurements on the construction site

Area levelling of high Accuracy

Tacheometric levelling with the K-version on flat terrain by combining stadia and angular measurements with height readings

Deformation measurement and monitoring of bridges  


Adjust the line of sight automatically


Easy to level up

The advantage of this instrument is that, as soon as the bubble is centred, the line of sight is horizontal for all pointings of the telescope. The observer is freed of the time-consuming centring procedure involved with the traditional tubular level, and can concentrate on the business of staff readings.


Robust and automatic

The compensator is essentially a pendulum with a prism (4). The suspension system comprises four flexed tapes (1) made of a special alloy to ensure faultless functioning even at extreme temperatures. The compensator, which is located between the focusing lens and the crosshair reticle, is pneumatically damped against mechanical vibration and is screened against magnetic fields.


Minimum maintenance

In the unlikely event that the compensator is damaged (and this can only happen as a result of extremely harsh treatment) it is replaced easily, being held only by three screws.


Top-class optics

The telescope is of excellent quality and gives a bright, high-contrast, erect image, even in poor light – an essential for accurate levelling. With the standard eyepiece the magnification is 32×, the optimum for most applications of the

instrument. Optional eyepieces are available; the 40× may be preferred for precise levelling, the 25× in hot, shimmer conditions. Eyepiece exchange takes only a second or so. The focusing knob has a coarse/fine movement:

– coarse, for rapid setting with minimum turning

– fine, for the final delicate touch to give the perfect image.


Fatigue-free viewing

The reticle has:

– a single horizontal hair for reading normal staffs

– a wedge-shaped hair for use with invar staffs

– stadia hairs for distance measurement and threewire levelling.


The general layout of the controls, the smooth friction-braked rotation of the instrument, and the endless horizontal drive with bilateral knobs, all combine to make the instrument easy to use.


At an advantage on unstable ground

If a tubular level is used on unstable ground it tilts out of range and has to be continuously reset. By contrast, the pendulum of the NA2 “compensates” and keeps the line of sight horizontal.


Angle measurement with the NAK2

Civil engineers and contractors often require a circle for angle measurement and setting-out work. Even simple detail surveys, by taking angle, distance and height, and plotting with the polar method, can be done with a level. The model NAK2 has an internal glass circle which is read via a scale microscope and which can be set to any value by turning the rim around the base of the instrument.


Standard deviation for 1 km double-run

levelling, depending on type of staff and on procedure

up to 0.7 mm

With parallel-plate micrometer

0.3 mm


erect image

Standard eyepiece


FOK73 eyepiece (optional)


FOK117 (optional)


Clear objective aperture

45 mm

Field of view at 100 m

2.2 m

Shortest focusing distance

1.6 m

Multiplication factor


Additive constant


Working range of compensator


Setting accuracy of compensator (stand. dev.)


Sensitivity of circular level

8’/2 mm

Glass circle (K version)

400 gon (360°)

Graduation diameter

70 mm

Graduation interval

1 gon (1°)

Reading by estimation to

10 mgon (1’)

Water- and dust resistance


Temperature range:



–20°C to +50°C (– 4°F to 122°F)


–40°C to +70°C (–40°F to 158°F)

Parallel-plate micrometer (optional )

GPM3, with glass scale

GPM6, with metal drum



10 mm

10 mm


0.1 mm

0.2 mm


0.01 mm

0.05 mm


Strong tripods


In principle, the NA2 can be set up on any Leica Geosystems tripod. In practice, for all-round purposes, we recommend the heavy-duty GST20 telescopic-leg tripod. For precise level ling the GST40 fixed-leg tripod is suitable because of its extreme rigidity. The modular relationship between instrument and tripod is an advantage when transport space is



Centring is easy


The circular level only needs to be centred approximately to bring the compensator well into its working range of ~30', and so setting-up goes quicker. The bubble is viewed positively via a pentaprism and is monitored down the eyepiece.


Play-free foot screws


The pitch of the smooth running and backlash-free foot screws is such that the bubble can be centred in a very short time. Independent of temperature Unlike the tubular level of a traditional instrument, the NA2 universal automatic

level is relatively insensitive to direct solar radiation and an umbrella need only be considered for the most precise levelling.


Independent of temperature


Unlike the tubular level of a traditional instrument, the NA2 universal automatic level is relatively insensitive to direct solar radiation and an umbrella need only be considered for the most precise levelling.