Sign up for our email newsletter to receive updates on new arrivals, discounted gear, workshops and more.
Subscribe
About Rock Block
Privacy Policy
Shipping Policy
Return Policy
Driving Directions
CLICK HERE To See Our EBAY Auctions
Two optocouplers (LED and lamp) offer distinctly different readings and uniquely varied compressions. The White Finger features multiple FETs instead of vacuum tubes, making it the affordable alternative.