Thank you for posting the questions.
Yes, it is always a challenge to convince customers, especially those outsider of analytical science field, to accept a specific method. The underline reasons could be relevant knowledge, past bad experience, price, etc. A few suggestions for your consideration:
- Understand background information from the customer— purpose of the test, sample information
- Use layman language to explain the difference of different methods (customer education process)
- Help customer to understand the pros and cons of using different methods from scientific point of view
- Sharing view on the potential risks of choosing wrong method
Hope it helps!