Ecosense pH100M Instrument, Probes, Cables & Accessories

EcoSense® pH100M pH/ORP/mV/Temperature Accurate, economical, handheld instrument The YSI EcoSense® instruments provide accurate data in the most affordable format. The "M" stands for memory and the instruments feature a real-time clock, larger memory and simple data transfer to a PC with a built-in USB port. The pH100M is easy-to-use, field-worthy and provides accurate and repeatable measurements.



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The pH100M measures pH, mV/ORP and temperature with the following features:

  • Rugged, waterproof, field-worthy case. IP-67 rated.
  • Waterproof micro-USB port for transferring data to PC; no software required.
  • Holds 250 data sets; no need to write down data.
  • Real-time clock for date/time stamp of saved data.
  • User-selectable re-calibration prompt provides reminder to calibrate.
  • Automatic buffer recognition (US or NIST buffer sets).
  • Automatic or manual temperature compensation.
  • 1-year instrument warranty; 6-month electrode warranty.
  • 1 and 4-meter field cables available; lab pH and ORP electrodes available.
  • Displays electrode efficiency.
  • Autolock mode holds stable readings on display.


The pH100M is designed for quick, accurate measurements in an economical platform. Easy-to-use, waterproof and backed by a 1-year warranty, the pH100M is ideal for a wide range of applications.

Parameters: pH units Temperature °C mV/ORP/Redox (oxidation reduction potential) mV

Manufacturer Specifications

Part Number Description Compatible With Additional Notes
Instrument Only YSIPH100M pH, mV, Temp Instrument Only
Probes and Cables
YSI100-1 Waterproof pH/Temp Field Probe and 1M Cable pH100/pH100A/pH100M
Probe/Cable Only
YSI100-4 Waterproof pH/Temp Field Probe and 4M Cable pH100/pH100A/pH100M
Probe/Cable Only
YSI110-1 pH Electrode and 1M Cable - Laboratory-Grade pH100/pH100A/pH100M
Probe/Cable Only
YSI111-1 pH Electrode, 1M Cable Piercing Double Junction pH100/pH100A/pH100M and Legacy pH 1200
Probe/Cable Only
YSI112-1 pH Electrode, 1M Flat Glass Double Junction pH100/pH100A/pH100M and Legacy pH 1200
Probe/Cable Only
YSI115-1 ORP Electrode and 1M Cable Laboratory-Grade pH100/pH100A/pH100M
Probe/Cable Only
YSI130-1 Temp Probe and 1 M Cable pH100/pH100A/pH100M
Probe/Cable Only
PH100M Kits YSi100CCM-01 pH100M, 1M Probe/Cable and Carrying Case
YSI100CCM-04 pH100M, 4M Probe/Cable and Carrying Case
YSI160 Electrode Simulator pH100A, pH100M
YSI440 440 Cable Weight Kit 100-1 & 100-4
YSI180a Carrying Case, Hard Plastic w/Form Fitted Foam Insert 12.5x9.5x3.7 pH100A, pH100M