Manual Polarimeter: This polarimeter has a measurement range of -180° to +180°. The light source is a sodium lamp with a wavelength of 589.44nm. It is suitable for 100/200mm test tubes. Applications: Suitable for industrial production, food seasoning, scientific experiments, agriculture, food and spice industries, etc. Functions: This polarimeter can measure the specific purity, concentration, and content of thousands of active substances, such as sugar solutions, turpentine oil, and camphor. Instructions for Use: Connect the power supply, illuminate the polarizing filter with polarized light, and observe a clear field of view through the eyepiece. Place the test tube in the measuring chamber, and rotate the vernier knob until the brightness in the field of view is uniform. Record the vernier scale value. Measurement complete. Service: If you have any questions, please feel free to contact us, and we will reply within 24 hours!