• Accuracy:
    • ±0.5% at 4% transmittance
    • ±0.005 at 0.3 AU
  • Resolution: 0.001 AU
  • Operating Wavelengths: 450, 500, 550, 575, 600 and 650 nm
  • Power: (3) AAA batteries
    • Via USB (Model 9500 only)
  • Waterproof; IP-67 (floats)
  • Large backlit graphic display
  • 100+ test choices on the photometer display
  • Automatic test cell adjustment from 12-20 mm diameter
  • Internal memory: 500 sample sets (Model 9500 only)


The YSI 9300 and YSI 9500 are economical photometers in small packages for any application. These portable photometers allow you to easily take readings directly in the field for 100+ parameters, eliminating the need for sample preservation. These portable, waterproof instruments enable quick, onsite analysis. All reagents are safe and easy to use.

The YSI 9300/9500 photometers have direct-reading concentrations with automatic set-up. They have a large, backlit graphic display, sample tube holder that accommodates various diameters, on-screen instructions, multiple languages and 100+ test choices on the photometer display.

The YSI 9500 photometer has all the great features of the 9300 as well as a waterproof USB connection, power via the USB port, an internal memory with 500 sample sets and user-selectable options that include: test units, sample number and dilution factor.

The advanced software built into the YSI 9500 instrument remembers the most recent tests, making it even quicker to use the next time. Up to 500 test results are held in the 9500's memory along with a date and time stamp. Simply connect to a PC via USB and drag and drop the files to the PC. Software updates can be completed through a simple USB connection. The YSI 9500 allows up to 30 user-defined test methods allowing full flexibility in a range of test methods.

The YSI 9300 photometer ships complete with hard-sided carrying case. The YSI 9500 photometer ships complete with hard-sided carrying case and waterproof USB cable.

Applications for the YSI 9300 and 9500 include:

  • Aquaculture
  • Aquarium management
  • Surface water
  • Education
  • Wastewater
  • Watershed management