Here's a couple of decent multimeters that will help measure the pulse signal.
http://www.sealey.co.uk/PLPageBuilder.asp?gotonode=ViewProduct&method=mViewProduct&productid=12537
http://www.beta-tools.co.uk/store/1...1.html?zenid=120ea51fdf78ae29e8ee2074599df8fb
I'd personally go for the Beta one (I have actually).
http://www.sealey.co.uk/PLPageBuilder.asp?gotonode=ViewProduct&method=mViewProduct&productid=12537
http://www.beta-tools.co.uk/store/1...1.html?zenid=120ea51fdf78ae29e8ee2074599df8fb
I'd personally go for the Beta one (I have actually).