Al-Adab al-Mufrad by al-Bukhary

Excellent edition, very serious, which are based on several manuscripts, several editions and Tahqiq previous (including that of Mohamad Fouad Abdelbaqi and al-Albani).
The Muhaqqiq gives the degree of authenticity for each Hadith, and he wrote annotations to understand the terms used in the Hadith and the context.
Finally the text is 100% harakat (chains of transmission and prophetic words).
The Muhaqqiq is part of the Deoband Dar al-Ouloum Indian School, which is one of the most authentic and traditional in the field of Hadith transmission. His work is prefaced by the Sheikh specialist of Hadith Dar al-Uloom Deoband.