GET THE COMPLETE SET
The Mechanical Systems and NHIE Content Manual and the Structural Systems and Business Manual contain over 900 pages of technical and administrative information, as well as information about the NHIE.
Both volumes together will benefit the exam candidate along with being a great technical reference for the experienced home inspector.

National Home Inspector Exam Complete Reference Set includes:
NHIE Volume 1 Mechanical Systems and NHIE Content
NHIE Volume 2 Structural Systems and Business