OHAUS precision is now available in a line of pen meters that provide accurate measurement of pH, oxidation-reduction potential (ORP), conductivity, salinity, and total dissolved solids (TDS). Starter pen meters are the economical option when you are simply looking for meters that will provide accurate measurement without restriction.
| Part Number | Model | Meter Type | Measurement Range | Accuracy |
| OH-30073970 | ST10 | pH | 0.00 - 14 pH | +0.1 pH |
| OH-30073972 | ST10C-A | Conductivity | 0.00 - 199.9 μs/cm | +2.5% FS |
| OH-30073973 | ST10C-B | Conductivity | 0.00 -1999 μs/cm | +2.5% FS |
| OH-30073974 | ST10C-C | Conductivity | 0.00 - 19.99 μs/cm | +2.5% FS |
| OH-30073984 | ST10R | ORP | -1000 - 1000 mV | 2mV |
| OH-30073982 | ST10S | Salinity | 0.0 - 10.0 ppt | +2.5% FS |
| OH-30073978 | ST10T-A | TDS | 0.0 - 100.0 mg/L | +2.5% FS |
| OH-30073979 | ST10T-B | TDS | 0.0 - 1000 mg/L | +10mm |
| OH-30073971 | ST20 | pH | 0.0 - 99.0 °C ; 0.00 - 14 pH | +0.05 pH / +0.5 °C |
| OH-30073975 | ST20C-A | Conductivity | 0.00 - 199.9 μs/cm ; 0.0 - 99.0 °C | +1.5% / +0.5% °C |
| OH-30073976 | ST20C-B | Conductivity | 0.0 - 99.0 °C ; 0 - 1999 μs/cm | +0.1 pH |
| OH-30073977 | ST20C-C | Conductivity | 0.0 - 99.0 °C ; 0.00 - 19.99 ms/cm | +1.5% / +0.5 °C |
| OH-30073986 | ST20D | Dissolved Oxygen | 0.0 -19.9 mg/L | +0.5% °C |
| OH-30393199 | ST20M-B | TDS ; Conductivity ; pH | 0.0 - 1000 mg/L ; 0.0 - 99.0 °C ; 0.00 - 14 pH ; 0 – 1999 μs/cm | +2.0 % F.S.;+ 0.05 pH / + 0.5 °C |
| OH-30393200 | ST20M-C | Conductivity ; pH ; Salinity | 0.00 - 10.0 ppt ; 0.0 - 99.0 °C ; 0.00 -14 pH ; 19.99 ms/cm | +2.0 % F.S.;+ 0.05 pH / + 0.5 °C |
| OH-30073985 | ST20R | ORP | -1000 - 1000mV ; 0.0 - 99.0 °C | + 2 mV / + 0.5 °C |
| OH-30073983 | ST20S | Salinity | 0.00 -80.0 ppt ; 0.0 - 99.0 °C | + 1.5% / + 0.5 °C |
| OH-30073980 | ST20T-A | TDS | 0.0 – 100.0 mg/L;0.0 – 99.0 °C | + 1.5% / + 0.5 °C |
| OH-30073981 | ST20T-B | TDS | 0.0 – 1000 mg/L;0.0 – 99.0 °C | + 1.5% / + 0.5 °C |
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