Product Description OM-100 Features: -Combo meter.-Electrical Conductivity Range: 0 - 9990 ?S; 0 - 9.99 Ms..-TDS Range: 0 - 8560 ppm (mg/L); 0 - 8.56 ppt..-Temperature Range: 0-80 degrees C; 32-176 degrees F..-Resolution: 0-99: 0.1 ?S/ppm/MS/ppt; 100-999: 1 ?S/ppm; 1000-9990: 10 ?S/ppm..-Temperature resolution is 0.1 degrees C/Accuracy: +/- 2pct..-EC to TDS Conversion Factor: Non-linear conversions for KCl, 442TM or NaCl solutions, selected by user..-Calibration: Digital calibration by push button..-Probe: Detachable platinum electrodes.. Includes: -Power source: 3 x 1.5V button cell batteries (included) (model 357A).. Specifications: -Housing: IP-67 Waterproof.. Dimensions: -Dimensions: 7.3'' H x 1.3'' W x 1.3'' D (18.5 x 3.4 x 3.4 cm)..-Weight: 0.20 Pounds (3.2 oz).-Overall dimensions: 9'' H x 3'' W x 2'' D. From the Manufacturer OM-100 Features: -Combo meter.-Electrical Conductivity Range: 0 - 9990 ?S; 0 - 9.99 Ms..-TDS Range: 0 - 8560 ppm (mg/L); 0 - 8.56 ppt..-Temperature Range: 0-80 degrees C; 32-176 degrees F..-Resolution: 0-99: 0.1 ?S/ppm/MS/ppt; 100-999: 1 ?S/ppm; 1000-9990: 10 ?S/ppm..-Temperature resolution is 0.1 degrees C/F.Accuracy: +/- 2pct..-EC to TDS Conversion Factor: Non-linear conversions for KCl, 442TM or NaCl solutions, selected by user..-Calibration: Digital calibration by push button..-Probe: Detachable platinum electrodes.. Includes: -Power source: 3 x 1.5V button cell batteries (included) (model 357A).. Specifications: -Housing: IP-67 Waterproof.. Dimensions: -Dimensions: 7.3'' H x 1.3'' W x 1.3'' D (18.5 x 3.4 x 3.4 cm)..-Weight: 0.20 Pounds (3.2 oz).-Overall dimensions: 9'' H x 3'' W x 2'' D.