This product appears in the ERE Water Catalogue 2026
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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.
Compare models
Your selection is highlighted. Select a row to switch.| 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 |
Documents
Calibration and repair
Send it to our Montreal service team. We evaluate the instrument and send a detailed quote before any work starts.
Compare with similar models
Ohaus · Water Quality Meter| Spec | This model Ohaus Starter™ Pen Metersfrom $90.00 USD
|  Ohaus Starter™ 2200 pH Bench Meterfrom $456.00 USD
|  Ohaus Starter™ 300 pH Portablefrom $481.00 USD
|  Aquasearcher™ AB23PH Bench Meterfrom $558.00 USD
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|---|---|---|---|---|
| Measurement Resolution | 0.01–10 pH | 0.1 °C;0.01 pH;1 mV | 0.1 °C;0.01 pH;1 mV | 0.1 °C;0.01 pH;1 mV |
| Measurement Range | 19 options | 0 – 100°C;0.00 – 14.00 pH;-1999 – 1999 mV | 0 – 100°C;0.00 – 14.00 pH;-1999 – 1999 mV | 0 – 100°C;0.00 – 14.00 pH;-1999 – 1999 mV |
Questions, answered
How fast will I get a price?
Send the quote request and a specialist replies within 4 business hours, Monday to Friday, 8:00 to 4:30 ET. This item also has an online price: you can buy it straight from the cart.
Can we pay on account or by purchase order?
Yes. With established credit, terms are Net 30 days, and you can send your purchase order with the quote request. We also accept Visa, Mastercard and American Express.
How is shipping charged?
Bought online, the shipping cost shows at checkout before you pay. On quotes and account orders, freight is F.O.B. Montréal: the carrier charge is worked out at shipment from the packed weight and dimensions, and added to your invoice. In-stock items can also be picked up the same day in Montréal (8605 rue du Champ-d'Eau).
Can I return it?
Yes, within 30 days of purchase, with a return authorization number from customer service first. A 25% restocking fee applies, unless it is a defect covered by the warranty. Special orders, hazardous materials, flammable liquids and gases can't be returned. Return policy
Can ERE calibrate or repair it?
Yes. Our Montréal service shop calibrates and repairs it in-house. Request service
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