The drk8067 automatic polarimeter uses light-emitting diodes as the light source, which avoids the trouble of frequent replacement of sodium lamps. The temperature control device in the instrument has heating and cooling functions. If a temperature-controlled test tube is used, the optical rotation of the sample can be controlled for temperature measurement. The large-screen LCD display on the instrument provides a man-machine dialogue menu operation mode, which is simple, intuitive, stable and reliable. The main technical parameters Measurement mode: optical rotation, specific rotation, concentration, sugar content Light source: LED + high-precision interference filter Working wavelength: 589nm (sodium D spectrum) Measuring range: ±45° (optical rotation) ±120°Z (sugar content) Minimum reading: 0.001° (optical rotation) 0.01°Z (brix content) Indication error: ±0.01°(-15°≤optical rotation ≤＋15°) ±0.02° (when optical rotation <-15° or optical rotation> + 15°) Repeatability (standard deviation δ): 0.002° (optical rotation) Temperature control range: 15℃-30℃ Temperature control accuracy: ±0.5℃ Display mode: large-screen color dot matrix LCD display Test tube: 200mm, 100mm common type, 100mm temperature control type The lowest transmittance of measurable samples: l% Power supply: 220V ±22V, 50Hz ±1Hz, 250W Instrument size: 718mm×342mm×230mm Net weight of the instrument: 35kg Output communication interface: USB and RS232 serial interface is selected by the on-screen menu