Technical data Laser transmitter   Pulley diameters Ø 2.5" (60 mm) and upwards    Laser class 2 Laser output power < 1 mW Laser wavelength 635–650 nm  Beam angle 60°  Accuracy Laser plane – Reference plane:  Parallelism: < 0.05°, Offset: < 0.008" (0.2 mm) Type of battery 1xR6 (AA) 1.5 V Operating time 8 hours continuously Material ABS plastic/Hard anodised aluminum Dimensions WxHxD: 5.8"x3.4x1.1" (145x86x30 mm) Weight 9.5 oz (270 g)     Detector unit   Displayed resolution Axial offset: 0.005" (0.1 mm). Angular value: 0.1°  Max. displayed error ±1 %  + 1 digit  Measurement distance Up to 9.8' (3 m) between transmitter and detector Measurement range Axial offset: ± 0.12" (3 mm). Angular value: ±3° Type of battery 1xLR61  9 V Operating time 24 hours continuously Material ABS plastic   Dimensions WxHxD: 5.3"x2.2"x1.8" (135x56x46 mm) Weight 7.7 oz (220 g)   Shaft alignment Sheave/pulley alignment D90 D130 D150 D160 Geometric measurement Shims Custom systems