In my experience, commercially made wafer bonders are very expensive pieces of junk. If you have no money now, you'll have even less after a few service calls. I would suggest building your own. If you are doing anodic bonding, a hot plate, 500 volt power supply and coat hanger electrode will do the job. If you want to do thermocompression bonding you can probably do better with a press and some off-the-shelf heating elements. Roger Shile -----Original Message----- Dear all: Now I`m looking for some economical ,even secondhand wafer level bonder. Because we have no enough money,so we can`t afford new machine. Please help me!We need it very much! regards Nielei