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YSI EcoSense pH100A



Country of Origin


Accurate, economical, handheld measurements

The EcoSense® line of compact, handheld instruments 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

Product dimension

EC300A System Specifications (Instrument, Probe, and Cable)

Temperature                                                    Range           -10 to +90°C (14 to 194°F)

                                                                        Resolution       0.1°C

                                                                        Accuracy      ±0.2°C or  ±0.4%, whichever is greater

Conductivity                                                     Range         0.0 µS to 200 mS, with auto ranging                                                           

                                                                         Range                     Resolution                          Accuracy (meter & probe)

                                                                       0 to 499.9 µS/cm           0.1 µS/cm                           ± (1% of reading + 2 µS/cm)

                                                                       0 to 4999 µS/cm            1 µS/cm                              ± (1% of reading + 5 µS/cm)

                                                                       0 to 49.99 mS/cm          0.01 mS/cm                       ± (1% of reading + 0.05 mS/cm)

                                                                       0 to 200.0 mS/cm          0.1 mS/cm                         ± (2.5% of reading + 0.5 mS/cm)

Salinity                                                              Range          Calculated; 0.0 to 70.0 ppt

                                                                        Resolution      0.1 ppt

                                                                        Accuracy         ±0.2% FS

Total Dissolved Solids                            TDS in g/L calculated; enter constant values from 0.30 to 1.00, default value 0.65

EC300A Additional Specifications

Operating range

                                              Temperature              0 to 50°C (32 to 122°F)

                                              Relative Humidity        up to 95%

Water rating                          IP67 waterproof

Size                                         78 mm wide (widest point) x 184 mm long x 37 mm deep (3.1 in. x 7.25 in. x 1.45 in.)

Weight with battery              272 grams (0.6 lb.)

ATC Probe                               Thermistor, 10kΩ / 25° C

Battery                                    One 9 volt included with purchase; 500 hour battery life

Reference temperature        15.0 to 25.0°C (59 to 77°F)

Temperature coefficient                         0.0% to 4.0%

Default cell constant                5.00

Cell constant range                 4.50 to 5.50

Calibration back-up                Yes

Audio feedback                      Yes, all keys

Autolock feature                     Yes

Memory                                  50 data set reviewable memory

Auto shutoff                            Automatically powers off after 30 minutes of inactivity


The EC300A is designed for quick, accurate results in an economical platform. The ability to measure conductivity, salinity, TDS and temperature in a simple, compact handheld allows the instrument to be used across multiple application sampling strategies. With a one-year instrument and electrode warranty, waterproof case and ease-of-use, the EC300A will fit your needs.


• 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


1 unit