The MX420 healthcare scale is an excellent choice for the facility that occasionally needs to weigh patients in wheelchairs or for those care providers who travel to a patient's home. The dual rails adjust in width to accommodate most wheelchairs. For more mobile patients, the scale also makes a convenient chair scale - simply place a chair on the rails and you are ready to weigh. For easy transport and storage, the scale folds in half and stores in soft sided carry bag (included). Note: The MX420 is recommended for use on hard flooring surfaces only.