YSI 9500 Deluxe Photometer Kit

The YSI 9500 photometer adds additional capabilities, including internal memory for 500 sample sets and waterproof USB connection to a chosen PC.


  • Rugged units are waterproof to IP67 specifications and run on standard AA batteries
  • Accuracy of +/-0.5% at 4% transmittance; +/-0.005 at 0.3 AU
  • Features automatic light wavelength selection for each of its pre-programmed test methods
List Price $1,512.00
Stock Check Availability  
YSI 9500 Deluxe Photometer Kit

The fully-featured YSI 9300 and 9500 portable photometers accurately analyze all the major inorganic constituents of water. They are rugged, fully waterproof, easy-to-use and provide quick, accurate test results.

The photometric technology uses light to measure color changes in water samples treated with a reagent. They are accurate to +/-0.005 at 0.3 absorbency units (au) and resolution is 0.001au. The sample is simply placed in the unique adaptive cell holder and a button pressed. The cell holder automatically adjusts to various round tube sizes.

The 9300 and 9500 feature automatic light wavelength selection for each of their pre-programmed test methods. They have easy-to-navigate menus and over 100 test choices, providing full flexibility. The software also remembers the most recent tests, making it even quicker to use next time.

Both units are sealed to IP67 specifications and run on standard AA batteries. The 9500 can be powered through the USB port from the computer, or via a standalone adapter. Each comes complete with a carry case and room to store the required reagents. Additionally, the 9500 can store up to 500 test results in its onboard memory, with a full audit trail of time, date, and results in chosen units. Once back at base, the test results are simply transferred to a PC by plugging it into the USB port and using the drag and drop file transfer utility.


  • Direct reading concentrations
  • Waterproof IP-67 rating
  • Large, backlit graphic display
  • Sample tube holder automatically adjusts for various diameters
  • On-screen instructions virtually eliminate reading manuals
  • Multiple languages (English, French, German, Spanish, Italian)
  • 100+ test choices
  • Waterproof USB connection that can also power the instrument
  • Internal memory for 500 sample sets
  • User-selectable options for test units, sample numbers, dilutions factors, or additional tests
  • (1) 9500 Photometer
  • (1) Hard-sided carrying case
  • (1) USB waterproof cable
  • (8) Sample tubes
  • (1) Dilution tube
  • (10) Crush rods
  • (1) Cleaning brush
  • (1) Light cap
  • (1) Operations manual
Questions & Answers
What wavelengths does my 9500 Photometer operate at?
The 9500 Deluxe Photometer operates at 450, 500, 550, 570, 600, and 650 nm.
Is the YSI 9500 a laboratory photometer?
The YSI 9500 deluxe photometer can be used in the lab or in the field. It is waterproof with a IP67 rating and is designed to float if accidentally dropped in the water.
What is a blank tube? Why do I need to use it?
A blank tube is filled with the sample, but without reagents. This tube allows the instrument to compensate for any inherent color in the sample prior to the actual parameter test.
Can my photometer be updated?
Yes. The 9500 Photometer can be upgraded with new test calibrations using a PC. The photometer can be updated with a disk or via the YSI website (www.YSI.com). No special computer software is required.
How do you calibrate the YSI 9500 Photometer?
The 9500 Photometer is pre-programmed with calibrations for each test parameter, so there is no user-calibration necessary.
Did you find what you were looking for?

Select Options

  Products 0 Item Selected
Part #
YSI 9500 Deluxe Photometer Kit
9500 deluxe microprocessor photometer kit
Check Availability  
  Accessories 0 Item Selected
Notice: At least 1 product is not available to purchase online
Multiple Products

have been added to your cart

There are items in your cart.

Cart Subtotal: $xxx.xx

Go to Checkout

In The News

Scientists studying krill track light levels during Arctic polar night

The Arctic is a fairly well-studied area, but the waters beneath it are something akin to the deep sea in that scientists have yet to tap the true potential they hold. One example of this is the little-known dependency that Arctic krill and phytoplankton have on light at the northern tip of the planet. From other investigations and past studies, scientists know that light is a trigger for the small marine organisms to move up and down in water columns everywhere, cueing them that it’s safe to search for food or signaling that they should hide from predators. But the Arctic is a special place, and its light patterns don’t conform with those found in other regions of our big blue marble.

Read More

Silver Springs, where flows are down and nutrients are up, provide outdoor classroom

A hundred years before Disney World, tourists flocked to Florida to see the crystal clear water flowing from the Silver Springs, one of the largest artesian spring systems in the world. Thousands of years before that, the springs' supply of freshwater and food supported early indigenous settlements. Today, the springs and the Silver River that they feed into are suffering from nutrient pollution and reduced flows brought on by Florida's population growth and agricultural production. Those problems have coated the river's bed with algae and cost the system its place as the highest-volume springs in the world.

Read More

NSF awards grant to Lacawac Sanctuary

The National Science Foundation has awarded the Lacawac Sanctuary a grant for the construction of a new lab for water quality research, according to the Times-Tribune. The $329,094 grant will also support additions to the sanctuary’s visitor’s center. The sanctuary will get a new water purification system and its lab will obtain an instrument for measuring phytoplankton, as well as a new spectrophotometer. Overall, the new construction projects will add to the sanctuary’s appeal to researchers from around the world. The sanctuary holds one of the United States’ most pristine lakes, Lake Lacawac, which was created by glaciers and has seen minimal human contact. It attracts prominent researchers, and officials say the improvements will help meet their needs.

Read More