Which is a multi-parameter colorimeter that is able to run tests for over 90 different parameters, used most often for determining Chlorine and pH determination?

• A. The DPD kit
• B. Bacon bombs
• C. Dippers
• D. The DR 900

Answer: (D)

The key idea is that this question is about a device that uses colorimetric analysis to measure many different water-quality parameters. A multi-parameter colorimeter like the DR 900 is built to read color changes produced by reagents and translate them into concentrations. It does this by sending light through a sample and measuring how much is absorbed at specific wavelengths. Because you can swap in different test kits or slides, the same instrument can handle more than 90 different parameters in total.

This makes it especially useful for chlorine and pH work, since chlorine tests commonly rely on a color change produced by DPD reagents and the photometer quantifies its intensity, while pH can be determined with indicators that produce a measurable color shift. The DR 900 is designed to cover these kinds of tests along with many others, which is why it’s the best fit here.

The other options don’t fit the description as well. A DPD kit is a single-parameter chlorine test kit, not a multi-parameter instrument. Dippers are simple sampling tools for grabbing water samples, not devices that measure multiple parameters. Bacon bombs aren’t standard laboratory equipment for this purpose.