Starting at $401.75 Starting at $381.66
  • Usually ships in 9 weeks



  • IP67 waterproof housing
  • 250 data set memory
  • Micro-USB port for transferring data to a PC
    • No software required
  • Real-time clock for date & time stamp of saved data
  • User-selectable recalibration prompt
  • 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


The YSI EcoSense pH100M 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. With a micro-USB port for transferring data to a PC (no software required), this YSI unit also features a memory that can hold up to 250 data sets.

The pH100M 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 pH100M will fit your needs.