This unit has barely been used over the past 10 years so it has a lot of use left in it. It powers up, works very well with smooth and quiet operation. The Peristaltic head is the R2 type (it has two rollers). This unit can be calibrated with fluid calibration columns to transfer measured amounts of fluid. Worked well for me while I was using it. It's been in storage for 8 years. Time to get it out of storage and back in use somewhere. Watson Marlow still supports the peristaltic hoses that fit this unit. Serial Number and other model details are as pictured.