SOLD - This is a PTC-225 (Peltier Thermal Cycler) model and comes with four Alpha Unit Blocks. These blocks have 96 wells each but can be substituted for 384 well blocks or 60 well blocks. Two blocks come with a Power Bonnet lid which permits remote control of the Alpha unit lid opening. This MJ Research DNA Engine Tetrad Gradient Cycler self-tested and was error-free.