Source: Chaplin, W. F., Phillips, J. B., Brown, J. D., Clanton, N. R., & Stein, J. L. (2000). Handshaking, gender, personality and first impressions. Journal of Personality and Social Psychology, 79, 110–117. 5 item scale to assess handshake characteristics.
Used in: Stewart, Greg L.; Dustin, Susan L.; Barrick, Murray R.; Darnold, Todd C. (2008). Exploring the handshake in employment interviews. Journal of Applied Psychology, 93:5, 1139 – 1146. Found high intercorrelation between handshake characteristics so they also created an overall score based on the average of the five items.