OHAUS ST20M Series, Instruction Manual, Page: 4 / 5

The electrode is replaceable.
Model Content Item No.
ST20M-B
ST20M-B pen meter (electrode included),
pH buffer powder pH4.01 / pH7.00 / pH10.01
30393199
ST20M-C
ST20M-C pen meter (electrode included),
pH buffer powder pH4.01 / pH7.00 / pH10.01
30393200
Description Item No.
ST20M-B Electrode 30393203
ST20M-C Electrode 30393204
Waterproof Pen Meters ST20M-B ST20M-C
pH Range 0.00
–
14.00 pH 0.00
–
14.00 pH
Conductivity Range 0-1999
μS/cm
0-19.99 mS/cm
pH Resolution 0.01 pH 0.01 pH
Conductivity Resolution 1
μS/cm
10
μS/cm
pH Accuracy ± 0.05 pH ± 0.05 pH
Conductivity Accuracy ± 2% FS ± 2% FS
Battery 4 x 1.5V 4 x 1.5V
Dimension 185 x 42 x 37 mm 185 x 42 x 37 mm
Weight 105 g 105 g
Auto-off After 6 min no operation After 6 min no operation
Ambient Temperature 0~50 °C (32-122 °F) 0~50 °C (32-122 °F)
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