1. Customer satisfaction: One of the best ways to know if you have delivered a proper product is by measuring customer satisfaction. Conducting surveys, gathering feedback, and monitoring online reviews can help you understand how your customers perceive your product. If customers are satisfied and expressing positive feedback, it is a good sign that you have delivered a proper product.
2. Repeat business: Another way to know if you have delivered a proper product is by looking at repeat business. If customers are returning to purchase your product again and again, it is a clear indication that they are happy with what they have received. This can be a strong indicator that you have delivered a proper product.
3. Meeting or exceeding expectations: If your product meets or exceeds customer expectations, you have delivered a proper product. This means that you have delivered a product that is of high quality, meets the customer’s needs, and is delivered in a timely manner.
4. Positive word-of-mouth: When customers talk positively about your product to others, it is a good indication that you have delivered a proper product. Word-of-mouth advertising is one of the most powerful forms of advertising, and it can be a sign that your product is well-regarded in the market.
5. Profitability: Delivering a proper product can also be measured by the profitability of your business. If your product is meeting the needs of customers and generating profits for your business, it is a clear indication that you have delivered a proper product.

In conclusion, delivering a proper product is essential for the success of any business. By measuring customer satisfaction, repeat business, meeting or exceeding expectations, positive word-of-mouth, and profitability, you can determine if you have delivered a proper product and take necessary actions to further improve your product and grow your business.