Photo: Ohaus Navigator product range

Ohaus Navigator (NV), Navigator XL (NVL) and Navigator XT (NVT) scales – what’s the difference?

Physical dimensions

While all scales in the Ohaus Navigator product range are fairly compact, their dimensions vary according to the series to which they belong. In our photo, you’ll see the Navigator XT (NVT) on the left, the narrow and lengthy Navigator XL (NVL) in the middle and the smaller Navigator (NV) on the right:
Ohaus Navigator scales

The Navigator (NV) is the only one with different platform shapes within the series: The NV212 – the only scale with 0,01g readability in the entire range – has a round platform as shown in the picture while higher capacity scales have a platform which is similar to the other series.

Dimensions (width x length x height in mm)

Navigator XT (NVT): 240 x 249.5 x 69.8
Navigator XL (NVL): 204 x 282 x 74
Navigator (NV): 204 x 212 x 58


All scales can use the same interface options (RS-232, USB or Ethernet) as they have the same option slot on the bottom. The photo provided by Ohaus shows the Navigator XL (NVL) with installed USB interface:
Ohaus Navigator XL (NVL) with USB interface installed

However, only the Navigator XL (NVL) and XT (NVT) series have room for an optional rechargeable battery:
Ohaus Navigator XL scale with installed optional rechargeable battery

The scales can also be used with non-rechargeable batteries (4 size AA batteries for the NV and 4 sice C batteries for the NVL and NVT).


All scales stabilize quickly (within one second according to Ohaus) and perform similarly:

Model Repeatability Linearity OCL
NV212 2 d ± 2 d ± 3 d
NV511 2 d ± 2 d ± 3 d
NV1101 2 d ± 2 d ± 3 d
NV2101 2 d ± 2 d ± 3 d
NV4101 2 d ± 2 d ± 3 d
NV5101 2 d ± 2 d ± 3 d
NVL511 2 d ± 2 d ± 3 d
NVL1101 2 d ± 2 d ± 3 d
NVL2101 2 d ± 2 d ± 3 d
NVL5101 2 d ± 2 d ± 3 d
NVL10000 2 d ± 2 d ± 3 d
NVL20000 2 d ± 2 d ± 3 d
NVT1601 2 d ± 2 d ± 3 d
NVT3201 2 d ± 2 d ± 3 d
NVT6401 2 d ± 2 d ± 3 d
NVT10001 2 d ± 2 d ± 3 d
NVT16000 2 d ± 2 d ± 3 d

The values are expressed in scale intervals (d, difference between two successive indications, often also referred to as “(display) division” or “readability”). OCL stands for off center load. To minimize the OCL error, place the weight in the center of the platform. Approved models are not included in the table as their availability varies by region.

Further information

200 years of legal metrology in Luxembourg

Did you know that Luxembourg’s law of August 21st 1816 made the metric system obligatory for all commercial transactions? I didn’t, until I was invited to the 200 year celebration “Bicentenaire de la Métrologie Légale”, which took place in Belval yesterday. The most prominent speaker, Luxembourg’s Deputy Prime Minister and Minister of the Economy Étienne Schneider, took this opportunity to announce that Luxembourg has decided to acquire an atomic clock.

Deputy Prime Minister and Minister of the Economy Étienne Schneider

Deputy Prime Minister and Minister of the Economy Étienne Schneider

Other speakers included ILNAS director Jean-Marie Reiff, BLM director Philippe Kadok, Professor Olivier Francis from the University of Luxembourg and Dr. Martin Milton, director of the BIPM. Mr. Kadok’s presentation contained a slide a few interesting facts about the Service de Métrologie Légale: In 2015, this relatively small sub-organization of the BLM verified 2861 petrol pumps and more than 1450 weighing instruments of all types throughout the country.

BLM director Philippe Kadok

BLM director Philippe Kadok

Several organizations with ties to the field of metrology had set up stands in the conference hall. The Service de Métrologie Légale’s stand showcased balances, weights and other measurement instruments. Sadly, recently retired director John Kirchen was nowhere to be seen.

Service de Métrologie Légale

Service de Métrologie Légale

A&D EK-610i balance used for density determination

A&D EK-610i balance used for density determination

Visitors were also invited to take a tour of ILNAS’ recently inaugurated EMC lab (used only for market surveillance purposes, not for product certification).