... of the ligh Characteristicsl Use the incandescence lamp plus filter stand for sodium lamp in order ... (more than 2000 hours).l Need not prewarm when turning on.l Measuring specific rotation, optical rotation ... 45°, -120°Z-+120°Zl Minimum Reading: 0.001°l Accuracy: ±(0.005°+ Measurement value ´ 0.03 %) ... ±(0.015°Z+ Measurement value ´ 0.03 %)l Repeatability (Standard Deviation s):£ 0.002° , £ 0.006 ...