The Leica Geosystems NA324 Optical Level has the following specification:
Telescope
Standard Deviation for 1km Double Levelling (ISO 17123-2): 2.0mm.Telescope Image: Upright.Magnification: 24x.Objective Aperture: 36mm.Shortest Target Distance From Instrument Axis: <1.0mm.Field of View At 100m: <2.1mm.Multiplication Factor: 100.
Compensator
Working Range: ± 15.Setting Accuracy (Standard Deviation): < 0.5in.Sensitivity: 2mm.
Horizontal Circle
Graduation: 360°.Graduation Interval: 1°.Operating Temperature Range: –20°C to +40°C.Weight: 1.5kg.