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Porsche Diagnostics
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Porsche 9268 LH and EZK

The original diagnostic tool. This device was used to diagnose Porsche 928.

Bosch 9268 LH and EZK tester

This device is no longer in production.

Porsche 9288/Bosch KTS-300 AKA Hammer

This second generation tool was used on C2, C4, and 968. The KTS-300 uses card modules for different makes of vehicles. The factory Porsche card module offers the most functionality.

Bosch Hammer 9288

The 9288 is no longer in production.

If your car has a check engine light you may be able read codes supported by this tool by using the blink code method.

Here is our write up on clearing fault codes on the Porsche 968
Here we cover how to read codes on the Porsche 964

Porsche System Tester 2 / KTS-500

The Porsche System Tester was introduced in 1997 for Porsche dealers to service the 986 and 996 model cars, though the Porsche System Tester 2 (PST2) is capable of diagnosing all models since the 928.
Porsche System Tester 2 (PST2)

The Porsche System Tester 2 is based on the Bosch KTS-500 computer system but uses Porsche specific software that is not available on the KTS-500.

Bosch KTS-500

The Porsche System Tester 2 and the KTS-500 are no longer available.

Porsche Integrated Workshop Infomation System (PIWIS) / KTS-650

The PIWIS is the latest Porsche diagnostic tool, and is similar to the Porsche System Tester 2 but also supports CAN-BUS vehicles. PIWIS also integrates repair manual information into the diagnostic tester. The PIWIS is only available on long term lease from Porsche for $12,000 per year.
The PIWIS is based on the Bosch KTS-650, but again it's software is Porsche specific. The Bosch KTS series supports some basic Porsche functions on Porsche 964, 969, and 944.

Bosch KTS-650

The PIWIS looks just like the KTS 650 except that it is grey instead of green.

Durametric Diagnostic Software

Durametric offers a diagnostic tool for Porsche that runs on a Windows computer and a USB adapter to communicate with Porsche cars.
Durametric Porsche Tool