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A photometer is an instrument for measuring light intensity or optical properties of solutions or surfaces.
A spectrophotometer is much more complex then a photometer, the may contain more mirros, slits, a grating filter. Photometers can be simpler to use.
No, reagents are sold separately on all photometers.
"We use HANNA because it is a valuable world wide brand. Their high performance and technology provide us with good water quality monitoring."
- Raciel Paredes
"I really love my Hanna Phosphate Photometer. It is really easy to use the re-agent and mix it with the aquarium water to get super accurate tests"
- Richard, AZ