Background information:

Quality figures for 2025:

Quality and reliability

Defects in the narrower sense: Product defects and interoperability problems
With respect to product defects and interoperability problems, the following return figures apply to the year 2025:
Problems upon commissioning	< 0.03%	=	> 99.97% quality
Failures within 1st year of operation	< 0.05%	=	> 99.95% reliability
Average of late failures per year	< 0.01%	=	> 99.99% reliability

The failure rate in the first year is primarily due to "early" failures of electronic components and can only be further reduced at great expenditure.

The rate of problems upon commissioning is extremely low and reflects the high quality of our products for which one would expect a higher rate of interoperability, due to their nature of interface products.

Defects in the broader sense: Failures due to incorrect product selection

We also record the return rate due to incorrectly chosen products in order to assess the quality of our marketing material and telephone support.
Problems upon commissioning	< 0,12%
Failures within 1st year of operation	< 0.24%
Average of late failures per year	< 0.03%

This rate could be reduced considerably, if customers would read our documents more carefully, or would contact our support team at an earlier stage. However, even customers that do not give the necessary attention to such details obviously fare well with our products.

On-time delivery:

All orders will be ready for shipment by the confirmed shipping date. Unless the customer specifies a delivery date, W&T generally ships standard products directly from stock.

Availability of spare parts:

As all products supplied by Wiesemann & Theis are developed and manufactured directly by the company, there have never been any problems as regards replacements or spare parts.