What's not checked in a pre-purchase inspection?

Brake function and lining material, brake drums, limited to what is immediately visible
Evidence of brake fluid contamination/hydraulic fluid
Anti-lock braking system (ABS) mechanics
Meters indicating oil and fuel consumption or the degree of oil and fuel consumption
Reason for oil leaks
Oil pump strainer to assess sludge build up
Wheel cylinders
Hybrid/Electric car Batteries
Vehicle electrics and electronics
Transmission mechanics
Engine cylinder compression
Engine mountings
Water pump/fan
Body water leaks or reason for leaks
Odometer and camshaft belt, drive belt and timing belt
Fuel flap release
Estimated expiry of exhaust system, clutch, dual mass flywheels
Standard to which repairs or service history have been completed
Functionality of audio-visual or entertainment system including CD, Cassette, TV, DVD, iPod connectivity, sensors, alarm/security devices, satellite navigation systems/GPS
Degree of gas emissions
Catalytic converters
Additional accessories included as a result of owner’s modifications
Mechanical switching of wipers and lights
LPG systems
Air conditioning efficiency
Status of habitation areas of motorhomes or caravans
Vehicle’s computer systems, such as trip meter computers, cruise control and any other computer systems
Technical systems