Rokc GS24X Dumpy Level Specs: Magnification:             24X Objective aperture:  40mm Resolution:               ≤4″ Field of View:               1°20′ Image:                         Erect Reticle: Cross reticle ( Optional: Wedge ) Min view Distance:      ≤0.3m View Distance Error:   ≤ ± 0.4% Focusing Error:          ≤0.5mm Compensator type:     magnetic Compensator range:   ≥ ±15′ Compensating error:   ≤ ± 0.3″