Spot Metering on Palm as Gray Card (Basic)

Spot metering a gray card is about as good as gauging exposure with an incident light meter.  But you don't need to bring a gray card with you.  Here's an old photography trick: just use the palm of the subject's hand (or anyone's hand), which is 1 stop brighter than middle gray (regardless of ethnicity).  Remember to put the palm near the face (or target), and adjust so that the light meter shows 1 stop over 0.