Photoelectric detection, automatic dial indicator, easy to operate. It can also be used for samples with low optical rotation that are difficult to analyze with a visual polarimeter.   The main technical parameters: Measurement mode: optical rotation Light source: sodium light + color filter, wavelength 589.44nm Measuring range: ±45 ° (optical rotation) Minimum reading: 0.001° (optical rotation) Indication error: ±(0.01+measured value×0.05%)° Repeatability (standard deviation δ): ≤0.01° Display mode: dial Test tube: 200mm, 100mm The lowest transmittance of measurable samples: l 0% Power supply: 220V±22V, 50Hz±1 Hz Instrument size: 600mm×320mm ×200mm Instrument quality: 29kg Accuracy: 0.05 level