Owner's FAQ DISTO E7400x (X310)

This is infrequently used content, but to expand accessibility to a wider audience we are using a machine for translation. Please excuse any unanticipated translation errors. -Thank you, Leica Geosystems.​

Take a closer look at our Leica DISTO™ E7300 (D210).

User Manual Leica DISTO™ E7400x (English)
User Manual Leica DISTO™ E7400x (Español)
Quick-Start Leica DISTO™ E7400x (aka X310 English only)
Leica DISTO™ E7400x (aka X310) CE Conformity Declaration
Leica DISTO™ E7400x (aka X310) Recycling Passport
Leica DISTO™ E7400x Brochure (English)
Leica DISTO™ E7400x aka X310 Brochure (Español)
Leica DISTO™ Self-Calibration (English only)

What happens if a number is visible on the display?  
This is a message code. The numbers are displayed if a successful measurement could not be performed. The user itself can correct the measuring situation to achieve a measurement. Below you can find the spread sheet from the manual with the corrections:


No. Cause Correction
156 Transverse tilt greater then 10° Hold the instrument without any transverse tilt
162 Calibration mistake Make sure, the device is placed on an absolutely horizontal and flat surface. Repeat the calibration procedure. If the mistake still occurs, contact your dealer.
204 Calculation error Perform measurement again.
252 Temperature too high Let device cool down.
253 Temperature too low Warm device up.
255                     Received signal too weak, measuring time too long

Change target surface (e.g. white paper).

256 Received signal too high Change target surface (e.g. white paper).
257 Too much background light Shadow target area.
258 Measurement outside of measuring range Correct range.
260 Laser beam interrupted Repeat measurement.


How to switch off/on the beep? 
The beep can be switched off (and on) with a long press simultaneously on minus key and reference key.

How to switch off/on the display illumination? 
The illumination can be switched off (and on) with a long press simultaneously on plus key and reference key.

How can I activate the keypad lock? 
To activate the keypad lock, press CLEAR/OFF key and minus key simultaneously for 2 sec.

How can I deactivate the keypad lock? 
To deactivate the keypad lock press the ON/DIST key and afterwards (within 2 Sec.) the MINUS key. Now the keypad lock is deactivated and the device is switched on.

What is the angular range of the Leica DISTO™ E7400x (X310)?
The angular range of the Leica DISTO™ E7400x (X310) is 360°.

What units of tilt can be used for the Leica DISTO™ E7400x (X310)? 
The following units can be used: °, %.

What exactly is the painter function and how does it work? 
The painter function calculates the sum of several individual  wall surfaces with a common height. Press func key 1x to go to the area function. Press plus- or minus key and measure the first wall length, press plus or -minus key again and measure the next wall length. The distance is automatically calculated. Repeat the procedure, until you have measured all wall lengths. 
2nd measurement: Measure the wall height. 
The result displays automatically the wall areas, which you have selected.

How can I clean the DISTO™ E7400x (X310)?
The device with its keypad and display can be easily cleaned under running water. Attention should be taken, that the water-jet is not directed onto the optical lens. If water is on the optical lens, it should be removed with a soft cloth. Water droplets can act as a lens and deflect the laser beam.

Measuring with tripod – is there anything to consider? 
The measuring reference has to be adjusted to the tripod thread. Press reference key 2 times and the tripod-reference is set permanently until the device switches off. After switching off the device goes back to the standard setting (rear of device).

What is measured with the height tracking? 
The height tracking displays an indirect height. The combination of inclination and distance measuring to the wall opens the possibility for such an indirect calculation. It is a useful function if the height cannot be measured directly or if several height points on the same vertical line need to be measured.

Can I calibrate the tilt sensor myself? 
Yes, it is possible. The procedure is described in the manual. Normally it is not necessary to calibrate the tilt sensor as it is already calibrated from Leica Geosystems. Only if a user detects an inaccuracy or after a strong drop it makes sense to calibrate the tilt sensor.

What is the measuring accuracy when using the direct horizontal measuring function?
For example, if a distance of 10m is measured with an angle of 10°, the error on the direct horizontal distance (fd) is 6mm. 
In order to have best results with indirect measurements considering the deviation of the tilt sensor use the Leica DISTO™ as follows. 
For measuring distances use the instrument as flat as possible. 
The horizontal distance error (fd) and the height error (fh) can be calculated as follows:
fd = horizontal distance error
fh = error in height
d = measured distance
a = angle at which the distance is measured
fa = possible angular error
fd = d * cos (a) – d * cos (a + fa)
fh= d * sin (a) – d * sin (a + fa)

Can I measure horizontal angles with the Leica DISTO™ E7400x (X310)? 
No, the integrated tilt sensor measures only vertical angles. If the device is held with a transverse tilt greater than +/-10° the display shows a message code 156, which means that the device should be held level (transversely).

Is it possible to obtain detailed information about the measurements taken? 
Yes, for some functions additional measuring information could be displayed. If a small triangle is visible in the left lower edge of the display, a long press on the prior function button shows additional information.

Can the historical memory in the device be erased?
Yes – a simultaneous press of 2 sec on CLEAR/OFF and UNIT/MEMORY key will erase the complete memory.

Can I use the DISTO™ E7400x (X310) with rechargeable batteries?
Yes, it is possible to use with standard rechargeable batteries. The more powerful the charger system is, the longer you can measure with the Leica DISTO™. We offer a powerful charger system, which is ideal to use with DISTO™: Leica charger UC20 with 2 Micro AAA NiMH batteries. For more information, please check our accessories.

What accessories are recommended?
For long distances we recommend using a tripod, even indoors. A tripod provides additional steadiness and therefore allows accurate targeting, especially over long distances. We particularly recommend the Leica TRI 70 with the adapter TA30 or LA360 and the Leica TRI 100 tripod. To enlarge the measuring range (especially outside), we recommend to use our target plates. If the laser dot is not visible, we recommend wearing laser glasses (GLB30).

How can I get an extra year’s warranty?
Our standard warranty of 2 years can be extended by one additional year if you register your device here within eight weeks of the purchase date. If the product is not registered, a two year warranty applies.

What does ISO 16331-1 tested mean?
When products and services meet our expectations, we tend to take this for granted and be unaware of the role of standards. However, when standards are absent, we soon notice. We soon care when products turn out to be of poor quality or are unreliable or dangerous. An ISO Standard ensures consistent quality and reliability for a product. 

The range and accuracy of laser distance meters depend greatly on lighting conditions and the reflective properties of the target object. For Leica Geosystems it is important that the performance of the device is maintained not only in the test laboratory but even more so on everyday site tasks. Therefore we have worked with external experts to develop a global standard to test and specify laser distance meters and allow comparisons between devices of different manufacturers. Instruments tested in accordance with ISO 16331-1 achieve their promises. Further information can be found here on our website.