Light source : Sodium lamp(Na), Mercury lamp(Hg) - Wavelength : 365, 405, 436, 546, 578, 589 nm or more - Modulator : Faraday cell - Aperture : 1.8, 3 and 8mm diameter - Detector : Photomultiplier tube - Angular range : ± 90° - Measurement accuracy : ± 0.002 ° or less than (up to 1 °) - Repeatability : ± 0.002° - Resolution :　± 0.0002° - Integration times : 1 - 100 sec - Sample cell length : 100 mm - Temperature range : 10 ~ 40℃ (minimum display temp : 0.1℃) - Temperature measurement accuracy : ±0.2 ℃