Starting at $275.00
Starting at $261.25

Some models in stock. View available part numbers.

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For ORP/mV measurements, the optional mV probe 605376 is required. The probe is available as an accessory
Warning: Damage caused by freezing isn't covered by warranty; we recommend 2-day shipping to reduce risk.


  • IP67 Waterproof housing
  • 1 year instrument warranty
  • Internal buffer recognition (US or NIST buffer sets)
  • Auto/Manual temperature compensation
  • Electrode offset recognition
  • Low battery indicator with 1000 hour battery life
  • Displays electrode efficiency
  • Autolock mode holds stable readings on display
  • Auto shutoff function after 30 minutes of inactivity
  • 50 data set memory

The YSI pH100A EcoSense pH100A pH/ORP Meter provides the most accurate data in the most affordable format. The instruments feature an easy-to-use interface, one-hand operation, IP67 waterproof case, and low cost of ownership over the life of the product.

The pH100A is designed for quick, accurate results in an economical platform. The ability to measure pH, mV/ORP, and temperature in a simple, compact handheld allows the instrument to be used in multiple applications. With a one-year instrument warranty, six-month electrode warranty, calibration backup, and a variety of cable/sensor options (glass bulb, flat tipped, and piercing tipped), the pH100A will fit your needs.

YSI EcoSense pH100 pH Probes
Probes and electrodes for use with the YSI pH100 meter
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Other part numbers are available to order but are not currently in stock. Current availability for non-stock parts is "Usually ships in 1-2 weeks". Click here to select options