Used relay module in Guangdong, China

Check the calibration status, overall condition, and whether all necessary accessories are included. It’s also important to verify the instrument's accuracy and functionality.

Use proper packaging with adequate cushioning to protect the instruments from shocks and vibrations. It's advisable to use a shipping service experienced in handling delicate electronic equipment.

Regularly calibrate the instruments to ensure accuracy, clean them to remove dust and debris, and store them in a protective case when not in use. Follow the manufacturer’s guidelines for specific maintenance tasks.