1. Do not bump or collide with the instrument to protect its accuracy and measurement integrity. 2. Immediately after use, wipe the prism and the refractive plates with a clean cloth to maintain optical cleanliness and ensure reliable readings. 3. Do not allow liquids to contact the adjustment knob or the eyepiece, as this can damage internal components. 4. Do not place the instrument in environments with relative humidity above 85 percent for extended periods, in order to preserve the performance of the optical system. Applications and practical scenarios - Laboratory calibration and precision measurements where maintaining optical accuracy and surface cleanliness is critical. - On-site field measurements that require careful handling and reliable readings from the prism and refractive plate optics. - Routine maintenance, inspection, and setup in workshops or laboratories to protect internal components and extend instrument life.