The Eidolon Hand Held Slit Lamp Model 510L comes with an unconditional 5-year guarantee. Repair or replacement of your unit through that period is free. If your warranty has expired, most units can be rebuilt to current standards and shipped back to you for $200. All of our out-of-warranty repair work is guaranteed for one year or if the damage to your unit is so extensive that the repair fee would exceed $200. If a total replacement is required, we will contact you directly.