Lab Colorimeters: what Claude and GPT would buy
Two AI models chose on their own, with no web access. Nobody tested these products: this is what each one says, and how to check it.
Claude and GPT choose the same product: Hach DR900
In Industrial & Scientific, Claude and GPT choose the same brand in 52 of 107 categories.
Claude Opus 5.5 · October 28, 2026
Hach DR900
A portable multiparameter colorimeter with a large library of preprogrammed methods tied to Hach's reagent chemistry, widely used in water and wastewater testing.
Not for: Users testing a single parameter (cheaper single-parameter testers suit them) or anyone measuring the color of surfaces and materials.
GPT 6.1 Sol · November 10, 2026
Hach DR900
Versatile water-analysis colorimeter with established reagent methods, straightforward operation, and a rugged design for routine laboratory and field testing.
Not for: Full-spectrum analysis, general material color measurement, or applications requiring spectrophotometer flexibility.
Which one fits you
single parameter, low cost
Hanna Instruments Checker HC (line)
Pocket colorimeters dedicated to one analyte, such as chlorine or phosphate.
Not for: Labs running many parameters or needing data logging.
pool, aquaculture or education multi-test
LaMotte SMART3 (line)
A multi-test colorimeter paired with LaMotte's tablet and liquid reagent systems.
Not for: Users already standardized on Hach methods.
surface or material color measurement
Konica Minolta (brand)
The reference brand for chroma meters and spectrophotometers used in color QC.
Not for: Water chemistry testing.
Check before you buy
Where to find Hach DR900
- Cole-Parmer
- Fisher Scientific
- Forestry Suppliers
Shops seen in search results on November 5, 2026. A shop missing here may sell it too. Nothing was checked by a person.
Brands that matter
- Hach: Water and wastewater standard.
- Hanna Instruments: Affordable Checker and multiparameter photometers.
- LaMotte: Pools, education and aquaculture.
- Konica Minolta: Material color measurement.
What to avoid
- Mixing reagent brands with a meter's preprogrammed methods
- Scratched or fingerprinted cuvettes
- Expired reagents
Questions
Colorimeter for water tests or for color matching?
These are different instruments. Water colorimeters measure analyte concentration with reagents, while chroma meters measure the color of a surface.