vedyog.net

In English:

Swami Dayanand Saraswati Commentary : The eight proofs are perception (= direct cognition), inference, comparison (= analogy), word testimony, history, concluding meaning, possibility, and absence are 'eight proofs'. From these proofs, a man can properly determine the truth and falseness.

---

In Hindi:

महर्षि दयानन्द व्याख्या : प्रत्यक्ष, अनुमान, उपमान, शब्द, ऐतिह्य, अर्थापत्ति, सम्भव और अभाव ये 'आठ प्रमाण' हैं। इन्हीं से सब सत्यासत्य का यथावत् निश्चय मनुष्य कर सकता है ।