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Ohaus Pen Meter ST20T-B Portable TDS and Temperature Meter

UsedOhausConductivity metersUnited States

€141.54excl. VAT

In stock

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Meter Type
TDS
Measurement Range
0.0 – 1000 mg/L; 0.0 – 99.0 °C
Accuracy
± 1.5% / ± 0.5 °C
Measurement Resolution
1 mg/L
Display
LCD
All 25 specifications
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Specifications 25

Brands
Ohaus
New/Used
Used
Meter Type
TDS
Measurement Range
0.0 – 1000 mg/L; 0.0 – 99.0 °C
Accuracy
± 1.5% / ± 0.5 °C
Measurement Resolution
1 mg/L
Display
LCD
ATC
Yes
Temperature Compensation
Automatic
Accuracy ± (Temperature)
0.5 °C
Automatic Shutdown
Yes, After 6 minutes of non-use
Battery Life
200 Hours with Disposable Batteries
Conductivity accuracy (±)
1.5 %
Conductivity measuring range
0 – 1000 mg/L
Dimensions (HxLxW)
7.28 in x 1.5 in x 1.77 in (185 mm x 38 mm x 45 mm)
Measurement Range (Temperature)
0 °C – 99 °C
Net Weight
3.88 oz (110 g)
Number of Buttons
3
Power
4 AG13 Batteries (Included)
Protection Rating
IP67
Temperature Display
Yes
Temperature Range
0 °C – 99 °C
Temperature Sensor
50 KΩ NTC
Working Environment
50°F – 104°F, 85%RH, non-condensing (10°C – 40°C, 85%RH, non-condensing)
Wrist Strap
Yes

Product description

Handheld TDS meter with automatic temperature compensation, IP67 waterproof, 0–1000 mg/L range, ±1.5% accuracy.

The Ohaus Pen Meter ST20T-B (Model #30073981) is a portable starter pen meter designed for accurate Total Dissolved Solids (TDS) and temperature measurement with the following specifications:

  • Meter Type: TDS (Total Dissolved Solids)
  • Measurement Range: 0.0 – 1000 mg/L for TDS; 0.0 – 99.0 °C for temperature
  • Accuracy: ±1.5% for TDS and ±0.5 °C for temperature
  • Measurement Resolution: 1 mg/L
  • Display: LCD with temperature display
  • Temperature Compensation: Automatic (ATC) using a 50 KΩ NTC temperature sensor
  • Conductivity Accuracy: ±1.5% within 0–1000 mg/L
  • Automatic Shutdown: Enabled after 6 minutes of non-use to conserve battery life
  • Battery: Powered by 4 AG13 disposable batteries (included), with an approximate battery life of 200 hours
  • Physical Dimensions: 7.28 in x 1.5 in x 1.77 in (185 mm x 38 mm x 45 mm)
  • Weight: 3.88 oz (110 g)
  • Protection Rating: IP67 waterproof, suitable for rugged and wet environments
  • Ergonomics: Durable plastic housing with a protective sensor cap and wrist strap to prevent accidental drops
  • Working Environment: Temperature range 10°C – 40°C (50°F – 104°F), relative humidity up to 85%, non-condensing
  • Controls: Three-button interface for simple operation

This meter delivers fast, straightforward, and reliable electrochemical measurements suitable for field and laboratory usage where portability and durability are required.

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Frequently asked questions

How long does laboratory equipment typically last?

With a service contract, ten to fifteen years is normal for most benchtop instruments. Detectors and pumps are the parts that wear first.

Can I get service for older equipment?

Often, yes. Verified suppliers frequently work with service partners converting the instrument. If applicable, we can list servicing options alongside the offer.

Where can I buy parts?

Ask a scientist through the request button. Parts are often available even when the instrument itself is discontinued.

What is the typical lead time for refurbished equipment?

Two to six weeks, depending on refurbishment scope and whether calibration is included.

Does laboratory equipment ship internationally?

We ship to 38 countries. Crating and customs handling are quoted with the instrument.

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Last updated 22 October 2026