altKinetic Systems (Boston, MA) offers the MK26 vibration isolation workstation for ultra-low natural frequency applications. It utilizes the Minus K® vertical isolator, which uses a stiff spring and a negative-stiffness mechanism to provide vertical stiffness without affecting the static load-supporting capability. Horizontal isolation is provided by beam columns connected in series with the vertical-motion isolator. Adjusted to a 1/2-Hz natural frequency, the workstation can achieve 93% isolation efficiency at 2 Hz, 99% at 5 Hz, and 99.7% at 10 Hz. The MK26 is available with a 650-pound gross load capacity. Optional equipment includes guard rails, non-isolated shelves, Faraday cages, and tabletop enclosures. Applications include analytical balances, cell injection, confocal microscopes, patch clamping, optical microscopes, wafer probing, sensor calibration, and atomic force microscopes.