Honeywell RTH8500 Guide D'installation page 6

Installation Guide
Pre-installation checklist
Required tools & supplies
• No. 2 Phillips screwdriver
• Small pocket screwdriver
• Drill
• Drill bit (3/16" for drywall, 7/32" for plaster)
• Hammer
• Pencil
• Electrical tape
• Level (optional)
• Three fresh AAA alkaline batteries