VEN asked:
I have to test the pH of about 200 substances, so will I have to buy 200 individual test strips? I also heard about indicator pens. Are those reusable? I would appreciate any help
Thanks!!
- VEN
I have to test the pH of about 200 substances, so will I have to buy 200 individual test strips? I also heard about indicator pens. Are those reusable? I would appreciate any help
- VEN
