I've been using Pico TA131 probes with the Siglent, and they're great. My only complaint is that they have the crap round rubber instead of form-fitted rubber on the ground clip. I pulled out the Siglent probes, and surprisingly, they have the form-fitted rubber on them. So I swapped 'em out and put them on the Picos, and now I'm much happier. The Siglent ground leads fit fine in the Pico probes. Pictured left is obviously the Pico, and right the Siglent ground clips.