How accurate is the laser level?

For the general construction purposes of builders, concreters, sub trades or draftsmen a self levelling laser level with an accuracy of between 10 and 20 arc seconds is more than adequate. This type of device will self-level much quicker and with a greater degree of accuracy than trying to manually set a liquid bubble on a manual laser level or dumpy.

For surveyors or those working on large sites where a high degree of accuracy is required over vast distances a specialised piece of equipment called a theodolite would best be used.

The level of accuracy of the FRE202 Automatic Self Levelling Rotary Laser Level is specified as ± 12arc seconds over 30 metres. What does this mean? Read below to find out.

The following formula converts arc seconds into millimetres.

Therefore the calculation for the FRE202 is as follows:

It is worth remembering that the arc seconds per distance as nominated by the manufacturer is specified as a worst case scenario, so generally the accuracy will be well within the stated range.