YSI 9800 Photometer

The YSI 9800 is a portable, multiparameter photometer for quickly and accurately measuring over 30 water quality parameters.


  • Waterproof IP-67 rating even when using a USB connection to power the instrument
  • Large, full-color touchscreen display works even with wet or gloved hands
  • Choose from 100+ tests or define your own
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The YSI 9800 is a portable, multiparameter photometer for quickly and accurately measuring over 30 water quality parameters. For use in the field or lab and featuring a large touchscreen display and an intuitive user interface with onscreen instructions, the 9800 Photometer is the ideal instrument for users of any level of experience operating in any environment!

Rugged and Modern
Waterproof IP-67 rating even when using a USB connection to power the instrument
Impact tested
Abrasion-resistant and chemical-resistant coating
Large, full-color touchscreen display works even with wet or gloved hands
Onscreen step-by-step test instructions
Comfrotable, ergonomic design

Smart, Versatile
Choose from 100+ tests or define your own
Multiple languages, including English, French, Spanish, and Mandarin
User-selectable options for test units, sample numbers, and dilution factors
Automatically stores all test results, data IDs, and user information for data compliance and traceability
Simple Data Management via USB connectivity also powers the instrument
User-upgradeable software via USB connection to PC
1,000 Data Set Memory

Fully serviceable and repairable over the life of the instrument
Carrying case composed of 100% recycled materials
Longer-lasting battery life (up to 5,000 tests per set)

Instrument Type Multiparameter Photometer
Wavelengths 430 nm, 465 nm, 530 nm, 575 nm, 620 nm
Accuracy ± 1%T (transmission)
Display Large, Color LCD
User Interface Touch screen with walkthrough text instructions
Width: 211 mm (8.3 in)
Length: 195 mm (7.7 in)
Height: 52 mm (2.0 in)
Weight 0.85 kg (1.87 lbs)
IP Rating IP-67
Power Supply 6x AA Batteries or through USB
Connectivity Connect to PC via USB cable
Memory Capacity 1,000 data sets
Battery Life 5,000 tests on one set of batteries
Languages English, French, Spanish, and Chinese (Simplified)
Certifications EN61326, EN61010, IP67, and EN60068-2-78
  • (1) 9800 Photometer
  • (1) Dilution tube
  • (1) Syringe (luer slip, 10mL)
  • (1) Polishing cloth
  • (1) Absorbent cloth
  • (1) Test tube brush
  • (10) Test tubes
  • (10) Stir rods
  • (1) USB Type A to C cable
  • (1) Reagent box
  • (1) Carrying case
  • (1) Quick Start Guide
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.
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YSI 9500 Deluxe Photometer Kit
9800 photometer kit, includes carrying case
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