pH Meter Pen ATC LCD Portable Digital  with 1 or 2 or 3 point calibration
pH Conductivity, TDS, Salinity, pH, and Temperature
Waterproof pH/Conductivity Meter; Measures 5 parameters
pH Conductivity, TDS, Salinity, pH, and Temperature
9 units of measure: pH, μS/cm, mS/cm, ppm, ppt, mg/L, g/L,°C°F
Analog bar graph Memory stores up to 25 readings.
Auto Power off with disable. protective cap,
four 3V CR-2032 batteries,
Conductivity to TDS ratio from 0.4 to 1.0; 0.5 fixed
Salinity rSpecifications pH : 0.00 to 14.00pH X 0.01pH
Conductivity : 0 to 199.9μS, 200 to 1999μS, 2.00 to 19.99mS
TDS/Salinity : 0 to 99.9ppm (mg/L),
100 to 999ppm (mg/L) :1.00 to 9.99ppt (g/L)
Temperature : 23° to 194°F (-5 to 90°C) X0.1’F/’C
Max. Resolution : 0.1μS, 0.1ppm (mg/L), 0.01pH,
Cat No Specifications Range Accuracy
AC-307-CPH pH meter Pen +electrode ATC 0-14pH 0.01pH
pH Conductivity, TDS, Salinity, pH, Temperature