I got this cheap Woods multimeter at Lowes a few years back for my Cary SLI-80...now use it on my SLI-80HS. Very simple and about $20.
https://mobileimages.lowes.com/product/converted/032886/032886958441.jpg?size=xl
https://mobileimages.lowes.com/product/converted/032886/032886958441.jpg?size=xl