• Don't expose the instrument to low / high temperature and sun light for long time, to avoid LCD losing effectiveness.
• Because the instrument is very precise, prevent it from violent shock.
• To avoid damage, don't disassemble and assemble the instrument or change the inner circuit and parts.
• Zero-setting should be implemented strictly according to instruction.
• Be sure to clean the prism surface and window of stage before and after every measurement.
• To avoid accuracy loss by evaporation, be sure to implement measurement immediately after dripping solution on
      window of stage.
• It can cause wrong results if measured under low voltage.
• Don't use the instrument in a humid and corrosive environment.
• Prevent the liquid from entering into battery house.
• Don't use it under the strong light (as sunlight, lamp etc.).