We guarantee the faultless function and design of the apparatus and measuring equipment supplied by us for a period of two years from the date of the invoice, in that we undertake to repair or replace, free of charge and as quickly as possible, any parts which become defective or unusable during this period as a result of faulty design, unsuitable material or defective workmanship, whereby the material which is the subject of the complaint is to be sent free of charge to our repair centre. We expressly reject any other liability for direct or indirect damage. Replaced components become our property. Warranty services which are carried out on our premises are free of charge if the unit to be repaired is sent free to our repair centre. For warranty work carried out at the customer’s premises, the travel and accommodation expenses for our engineer or technician will be charged at cost. The actual repair time shall be borne by us, while the time spent on the outward and return journey shall be borne by the customer. Our warranty obligation shall expire if the delivered apparatus and equipment are not installed, commissioned and maintained by the buyer in accordance with our instructions or if they are handled improperly. Apparatus which is stored for a longer period of time or which is out of operation must be stored in dry rooms. Likewise, the warranty shall expire if the purchaser himself or through third parties, without our written consent, removes seals affixed to our makes or carries out modifications or repairs. The following are excluded from the guarantee Natural material wear and tear, damage as a result of defective construction work, as a result of freezing, excessive stress, corrosion and the like. Our separate conditions apply to technical services at the customer’s premises after expiry of the warranty.