The SCHILLER CS 200 is a device that brings joy to scientists – also for the once who want to replace it by an affordable open source alternative

Last Updated on July 29, 2026 by pg@petergamma.org

Today I really suffered from all the devices on www.petergamma.org which are only of limited use for scientific studies. But the SCHILLER CS 200 is a device that brings joy to scientists.

But then I realized that I am not far from having my first devices. For scientists starting from 3 channel ECG devices which are the gold standard for heart rate measurements things become interesting.

We reported on www.petergamma.org about this topic:

090. Review of Accuracy Studies of Consumer Grade Heart Rate Monitors: Methods, Testing Protocols, Reference Devices

It should be possible to build a 3 channel gold standard ECG device for less than 100 USD with the equipment we listed on our site.

Key components are the:

the AD8232

And the ADS1115 16-Bit-Analog-Digital-Wandler

A used spirometer from iWorx which can be bought from eBay for a view hundert dollars

And a curved treadmills imported from China:

The hardware costs of this setup is only about 5 000 USD, instead of CS 200 for 25 000 USD in the Dr. Toys store:

Schiller CS-200 Excellence Stress System with Treadmill