Packing slip, purchase order and invoice are all considered valid for proof of purchase.
Free item must be of equal or lesser value. Not for sale.
Limited to two redemptions per offer, per customer and/or per laboratory. Offer valid for US and Canadian customers only. Availability for certain products may be limited by federal, state, provincial or local licensing requirements. Offer valid while supplies last. Not valid on prior purchases. DWK distributors and employees are prohibited from participating. Void in government accounts or where prohibited by law or company policy. Proces subject to change without notice. Trademarks contained herein are the property of thier respective owners.