Square Platform Laboratory Jack
Laboratory support jacks are constructed of chemically resistant anodized aluminum and stainless steel. The scissor jack design enables height adjustment with a simple turn of the knob. LBJK44 has a 4" x 4" platform that can be vertically adjusted
Video Link :
https://www.youtube.com/watch?v=2pf1qHUSBL0&feature=emb_imp_woyt