It's a good tool. If you have a thinkpad, there are extras that can be installed to support battery charge thresholds, etc. My x220 idles at around 6.5 Watts

It's a good tool. If you have a thinkpad, there are extras that can be installed to support battery charge thresholds, etc. My x220 idles at around 6.5 Watts with wifi on, bluetooth off.