Doppler echocardiography is the preferred diagnostic tool for evaluation of mitral valve stenosis
The tool that is used to evaluate task overload is called a time study. Manufacturer's use this tool to make the employee's work more efficient. This tool also helps to identify safety hazards.
stethoscope
A rubic is a tool used to evaluate a picece of writing
A valve spring compressor
shredder valve.
Protocol analyzer
you need to compress the spring with a valve spring compressor tool, and then remove the valve keepers, and retainer.
cobol
valve spring compresser
Feeler gauges.
it is a tool that resurfacese the seat on a water faucet valve
If the refrigerant has escaped, get a a/c valve stem kit from a autoparts store. They cost a few dollars and come with a stem tool and a few valve stem core that resemble tire valve stem cores. If you still have pressure, you will need a special tool that costs about 40 bucks.