Features:

Tester for Series 200 is a chemical tester that helps differtiate series 200 stainless steel from other series.

Method:

1. Firstly, use emerypaper to polish the surface of the steel piece for testing [To remove the chromium oxide from the steel surface].

2. Clean up the steel piece, remove the oil, dirt, paint and other impurities from the surface.

3. Drop the tester [approximately 0.1mL] on the steel piece, then wait for 1 minutes.

4a. If the tester change colour from 'green' to 'pink', the steel series of the testing object is 200.