Starter Pen Meters

After more than a century of perfecting the art of measurement through our durable weighing products, 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.

Ohaus

St10

SKU: oh-30073970

$83.00

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Ohaus

St10C-A

SKU: oh-30073972

$109.00

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Ohaus

St10C-B

SKU: oh-30073973

$109.00

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Ohaus

St10C-C

SKU: oh-30073974

$109.00

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Ohaus

St10R

SKU: oh-30073984

$178.00

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Ohaus

St10S

SKU: oh-30073982

$109.00

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Ohaus

St10T-A

SKU: oh-30073978

$123.00

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Ohaus

St10T-B

SKU: oh-30073979

$123.00

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Ohaus

St20

SKU: oh-30073971

$142.00

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Ohaus

St20C-A

SKU: oh-30073975

$159.00

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Ohaus

St20C-B

SKU: oh-30073976

$159.00

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Ohaus

St20C-C

SKU: oh-30073977

$159.00

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Ohaus

St20D

SKU: oh-30073986

$553.00

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Ohaus

St20M-B

SKU: oh-30393199

$181.00

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Ohaus

St20M-C

SKU: oh-30393200

$181.00

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Ohaus

St20R

SKU: oh-30073985

$238.00

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Ohaus

St20S

SKU: oh-30073983

$159.00

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Ohaus

St20T-A

SKU: oh-30073980

$159.00

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Ohaus

St20T-B

SKU: oh-30073981

$159.00

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Starter Pen Meters St10 Specifications
Accuracy	±0.1 pH
Automatic Shutdown	Yes, After 6 minutes of non-use
Auxiliary Display Model	LCD
Battery Life	200 Hours with Disposable Batteries
Internal Calibration	NA
Measurement Range	0.00 - 14 pH
Measurement Resolution	0.1 pH
Meter Type	pH
Net Weight	3.88 oz (110 g)
Number of Buttons	1
pH accuracy (±)	0.1
pH measuring range	0 ; 14
Protection Rating	IP67
Working Environment	50°F - 104°F, 85%RH, non-condensing (10°C - 40°C, 85% RH, non-condensing)
Wrist Strap	Yes

Starter Pen Meters St10C-A Specifications
Accuracy	±2.5% FS
Automatic Shutdown	Yes, After 6 minutes of non-use
Auxiliary Display Model	LCD
Battery Life	200 Hours with Disposable Batteries
Internal Calibration	NA
Conductivity Accuracy (±)	2.5 %
Conductivity measuring range	0.0 - 199.9 µS/cm
Measurement Range	0.00 - 199.9 μs/cm
Measurement Resolution	0.1 μs/cm
Meter Type	Conductivity
Net Weight	3.88 oz (110 g)
Number of Buttons	1
Protection Rating	IP67
Working Environment	50°F - 104°F, 85%RH, non-condensing (10°C - 40°C, 85% RH, non-condensing)
Wrist Strap	Yes

Starter Pen Meters St10C-B Specifications
Accuracy	±2.5% FS
Automatic Shutdown	Yes, After 6 minutes of non-use
Auxiliary Display Model	LCD
Battery Life	200 Hours with Disposable Batteries
Internal Calibration	NA
Conductivity Accuracy (±)	2.5 %
Conductivity measuring range	0 - 1999 µS/cm
Measurement Range	0 - 1999 μs/cm
Measurement Resolution	1μs/cm
Meter Type	Conductivity
Net Weight	3.88 oz (110 g)
Number of Buttons	1
Protection Rating	IP67
Working Environment	50°F - 104°F, 85%RH, non-condensing (10°C - 40°C, 85% RH, non-condensing)
Wrist Strap	Yes

Starter Pen Meters St10C-C Specifications
Accuracy	±2.5% FS
Automatic Shutdown	Yes, After 6 minutes of non-use
Auxiliary Display Model	LCD
Battery Life	200 Hours with Disposable Batteries
Internal Calibration	NA
Conductivity Accuracy (±)	2.5 %
Conductivity measuring range	0.00 - 19.99 mS/cm
Measurement Range	0.00 - 19.99 ms/cm
Measurement Resolution	10 μs/cm
Meter Type	Conductivity
Net Weight	3.88 oz (110 g)
Number of Buttons	1
Protection Rating	IP67
Working Environment	50°F - 104°F, 85%RH, non-condensing (10°C - 40°C, 85% RH, non-condensing)
Wrist Strap	Yes

Starter Pen Meters St10R Specifications
Accuracy	2mV
Accuracy ± (mV)	2 mV
Automatic Shutdown	Yes, After 6 minutes of non-use
Auxiliary Display Model	LCD
Battery Life	200 Hours with Disposable Batteries
Internal Calibration	NA
Measurement Range	-1,000 mV ; 1,000 mV
Measurement Resolution	1 mV
Meter Type	ORP
Net Weight	3.88 oz (110 g)
Number of Buttons	1
Protection Rating	IP67
Working Environment	50°F - 104°F, 85%RH, non-condensing (10°C - 40°C, 85% RH, non-condensing)
Wrist Strap	Yes

Starter Pen Meters St10S Specifications
Accuracy	±2.5% FS
Automatic Shutdown	Yes, After 6 minutes of non-use
Auxiliary Display Model	LCD
Battery Life	200 Hours with Disposable Batteries
Internal Calibration	NA
Conductivity Accuracy (±)	2.5 %
Conductivity measuring range	0.0 - 10.0 ppt
Measurement Range	0.0 - 10.0 ppt
Measurement Resolution	0.1 ppt
Meter Type	Salinity
Net Weight	3.88 oz (110 g)
Number of Buttons	1
Protection Rating	IP67
Working Environment	50°F - 104°F, 85%RH, non-condensing (10°C - 40°C, 85% RH, non-condensing)
Wrist Strap	Yes

Starter Pen Meters St10T-A Specifications
Accuracy	±2.5% FS
Automatic Shutdown	Yes, After 6 minutes of non-use
Auxiliary Display Model	LCD
Battery Life	200 Hours with Disposable Batteries
Internal Calibration	NA
Conductivity Accuracy (±)	2.5 %
Conductivity measuring range	0.0 - 100.0 mg/L
Measurement Range	0.0 - 100.0 mg/L
Measurement Resolution	0.1 mg/L
Meter Type	TDS
Net Weight	3.88 oz (110 g)
Number of Buttons	1
Protection Rating	IP67
Working Environment	50°F - 104°F, 85%RH, non-condensing (10°C - 40°C, 85% RH, non-condensing)
Wrist Strap	Yes

Starter Pen Meters St10T-B Specifications
Accuracy	± 10mm
Automatic Shutdown	Yes, After 6 minutes of non-use
Auxiliary Display Model	LCD
Battery Life	200 Hours with Disposable Batteries
Internal Calibration	NA
Conductivity Accuracy (±)	2.5 %
Conductivity measuring range	0 - 1000 mg/L
Measurement Range	0.0 - 1000 mg/L
Measurement Resolution	1 mg/L
Meter Type	TDS
Net Weight	3.88 oz (110 g)
Number of Buttons	1
Protection Rating	IP67
Working Environment	50°F - 104°F, 85%RH, non-condensing (10°C - 40°C, 85% RH, non-condensing)
Wrist Strap	Yes

Starter Pen Meters St20 Specifications
Accuracy	± 0.05 pH / ± 0.5 °C
Accuracy (Temperature)	0.5 °C
ATC	Yes
Automatic Shutdown	Yes, After 6 minutes of non-use
Auxiliary Display Model	LCD
Battery Life	200 Hours with Disposable Batteries
Internal Calibration	3 Point
Measurement Range	0.0 - 99.0 °C; 0.00 - 14 pH
Measurement Range (Temperature)	0 °C ; 99 °C
Measurement Resolution	0.01 pH
Meter Type	pH
Net Weight	3.88 oz (110 g)
Number of Buttons	3
pH accuracy (±)	0.05
pH measuring range	0 ; 14
Protection Rating	IP67
Temperature Compensation	Automatic
Temperature Display	Yes
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

Starter Pen Meters St20C-A Specifications
Accuracy	± 1.5% / ± 0.5 °C
Accuracy (Temperature)	0.5 °C
ATC	Yes
Automatic Shutdown	Yes, After 6 minutes of non-use
Auxiliary Display Model	LCD
Battery Life	200 Hours with Disposable Batteries
Internal Calibration	1 Point
Conductivity Accuracy (±)	1.5 %
Conductivity measuring range	0.0 - 199.9 µS/cm
Measurement Range	0.00 - 199.9 μs/cm; 0.0 - 99.0 °C
Measurement Range (Temperature)	0 °C ; 99 °C
Measurement Resolution	0.1 μs/cm
Meter Type	Conductivity
Net Weight	3.88 oz (110 g)
Number of Buttons	3
Protection Rating	IP67
Temperature Compensation	Automatic
Temperature Display	Yes
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

Starter Pen Meters St20C-B Specifications
Accuracy	±0.1 pH
Accuracy (Temperature)	0.5 °C
ATC	Yes
Automatic Shutdown	Yes, After 6 minutes of non-use
Auxiliary Display Model	LCD
Battery Life	200 Hours with Disposable Batteries
Internal Calibration	1 Point
Conductivity Accuracy (±)	1.5 %
Conductivity measuring range	0 - 1999 µS/cm
Measurement Range	0.0 - 99.0 °C; 0 - 1999 μs/cm
Measurement Range (Temperature)	0 °C ; 99 °C
Measurement Resolution	1μs/cm
Meter Type	Conductivity
Net Weight	3.88 oz (110 g)
Number of Buttons	3
Protection Rating	IP67
Temperature Compensation	Automatic
Temperature Display	Yes
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

Starter Pen Meters St20C-C Specifications
Accuracy	± 1.5% / ± 0.5 °C
Accuracy (Temperature)	0.5 °C
ATC	Yes
Automatic Shutdown	Yes, After 6 minutes of non-use
Auxiliary Display Model	LCD
Battery Life	200 Hours with Disposable Batteries
Internal Calibration	1 Point
Conductivity Accuracy (±)	1.5 %
Conductivity measuring range	0.00 - 19.99 mS/cm
Measurement Range	0.0 - 99.0 °C; 0.00 - 19.99 ms/cm
Measurement Range (Temperature)	0 °C ; 99 °C
Measurement Resolution	10 μs/cm
Meter Type	Conductivity
Net Weight	3.88 oz (110 g)
Number of Buttons	3
Protection Rating	IP67
Temperature Compensation	Automatic
Temperature Display	Yes
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

Starter Pen Meters St20D Specifications
Accuracy	±0.5 °C
Accuracy (Temperature)	0.5 °C
ATC	Yes
Automatic Shutdown	Yes, After 6 minutes of non-use
Battery Life	100 Hours with Disposable Batteries
Internal Calibration	1 Point
Measurement Range	0.0 - 19.9 mg/L
Measurement Resolution	0.1 mg/L
Meter Type	Dissolved Oxygen
Net Weight	3.88 oz (110 g)
Number of Buttons	3
Protection Rating	IP67
Temperature Compensation	Automatic
Temperature Display	Yes
Temperature Sensor	50 KΩ NTC
Working Environment	41°F - 104°F, 80% RH, Non-condensing (5°C - 40°C, 80% RH, Non-condensing)
Wrist Strap	Yes

Starter Pen Meters St20M-B Specifications
Accuracy	±2.0 % F.S.; ± 0.05 pH / ± 0.5 °C
ATC	Yes
Automatic Shutdown	Yes, After 6 minutes of non-use
Battery Life	100 Hours with Disposable Batteries
Internal Calibration	3 Point
Conductivity Accuracy (±)	2 %
Conductivity measuring range	0 - 1999 µS/cm
Measurement Range	0.0 - 1000 mg/L; 0.0 - 99.0 °C; 0.00 - 14 pH; 0 - 1999 μs/cm
Measurement Resolution	1μs/cm; 0.01 pH
Meter Type	TDS; Conductivity; pH
Net Weight	3.88 oz (110 g)
Number of Buttons	3
pH accuracy (±)	0.05
pH measuring range	0 ; 0
Protection Rating	IP67
Temperature Display	Yes
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

Starter Pen Meters St20M-C Specifications
Accuracy	±2.0 % F.S.; ± 0.05 pH / ± 0.5 °C
ATC	Yes
Automatic Shutdown	Yes, After 6 minutes of non-use
Battery Life	100 Hours with Disposable Batteries
Internal Calibration	3 Point
Conductivity Accuracy (±)	2 %
Conductivity measuring range	0.00 - 19.99 mS/cm
Measurement Range	0.0 - 10.0 ppt; 0.0 - 99.0 °C; 0.00 - 14 pH; 0.00 - 19.99 ms/cm
Measurement Resolution	0.1 °C; 0.1 ppt; 0.01 pH; 0.01ms/cm
Meter Type	Conductivity; pH; Salinity
Net Weight	3.88 oz (110 g)
Number of Buttons	3
pH accuracy (±)	0.05
pH measuring range	0 ; 0
Protection Rating	IP67
Temperature Display	Yes
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

Starter Pen Meters St20R Specifications
Accuracy	± 2 mV / ± 0.5 °C
Accuracy ± (mV)	2 mV
Accuracy (Temperature)	0.5 °C
ATC	Yes
Automatic Shutdown	Yes, After 6 minutes of non-use
Auxiliary Display Model	LCD
Battery Life	200 Hours with Disposable Batteries
Internal Calibration	NA
Measurement Range	-1,000 mV ; 1,000 mV
Measurement Range (Temperature)	0 °C ; 99 °C
Measurement Resolution	1 mV
Meter Type	ORP
Net Weight	3.88 oz (110 g)
Number of Buttons	2
Protection Rating	IP67
Temperature Compensation	Automatic
Temperature Display	Yes
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

Starter Pen Meters St20S Specifications
Accuracy	± 1.5% / ± 0.5 °C
Accuracy (Temperature)	0.5 °C
ATC	Yes
Automatic Shutdown	Yes, After 6 minutes of non-use
Auxiliary Display Model	LCD
Battery Life	200 Hours with Disposable Batteries
Internal Calibration	1 Point
Conductivity Accuracy (±)	1.5 %
Conductivity measuring range	0.0 - 80.0 ppt
Measurement Range	0.0 - 80.0 ppt; 0.0 - 99.0 °C
Measurement Range (Temperature)	0 °C ; 99 °C
Measurement Resolution	0.1 ppt
Meter Type	Salinity
Net Weight	3.88 oz (110 g)
Number of Buttons	3
Protection Rating	IP67
Temperature Compensation	Automatic
Temperature Display	Yes
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

Starter Pen Meters St20T-A Specifications
Accuracy	± 1.5% / ± 0.5 °C
Accuracy (Temperature)	0.5 °C
ATC	Yes
Automatic Shutdown	Yes, After 6 minutes of non-use
Auxiliary Display Model	LCD
Battery Life	200 Hours with Disposable Batteries
Internal Calibration	NA
Conductivity Accuracy (±)	1.5 %
Conductivity measuring range	0.0 - 100.0 mg/L
Measurement Range	0.0 - 100.0 mg/L; 0.0 - 99.0 °C
Measurement Range (Temperature)	0 °C ; 99 °C
Measurement Resolution	0.1 mg/L
Meter Type	TDS
Net Weight	3.88 oz (110 g)
Number of Buttons	3
Protection Rating	IP67
Temperature Compensation	Automatic
Temperature Display	Yes
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

Starter Pen Meters St20T-B Specifications
Accuracy	± 1.5% / ± 0.5 °C
Accuracy (Temperature)	0.5 °C
ATC	Yes
Automatic Shutdown	Yes, After 6 minutes of non-use
Auxiliary Display Model	LCD
Battery Life	200 Hours with Disposable Batteries
Internal Calibration	NA
Conductivity Accuracy (±)	1.5 %
Conductivity measuring range	0 - 1000 mg/L
Measurement Range	0.0 - 1000 mg/L; 0.0 - 99.0 °C
Measurement Range (Temperature)	0 °C ; 99 °C
Measurement Resolution	1 mg/L
Meter Type	TDS
Net Weight	3.88 oz (110 g)
Number of Buttons	3
Protection Rating	IP67
Temperature Compensation	Automatic
Temperature Display	Yes
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

Starter Pen Meters

St10

St10C-A

St10C-B

St10C-C

St10R

St10S

St10T-A

St10T-B

St20

St20C-A

St20C-B

St20C-C

St20D

St20M-B

St20M-C

St20R

St20S

St20T-A

St20T-B

Starter Pen Meters St10 Specifications

Starter Pen Meters St10C-A Specifications

Starter Pen Meters St10C-B Specifications

Starter Pen Meters St10C-C Specifications

Starter Pen Meters St10R Specifications

Starter Pen Meters St10S Specifications

Starter Pen Meters St10T-A Specifications

Starter Pen Meters St10T-B Specifications

Starter Pen Meters St20 Specifications

Starter Pen Meters St20C-A Specifications

Starter Pen Meters St20C-B Specifications

Starter Pen Meters St20C-C Specifications

Starter Pen Meters St20D Specifications

Starter Pen Meters St20M-B Specifications

Starter Pen Meters St20M-C Specifications

Starter Pen Meters St20R Specifications

Starter Pen Meters St20S Specifications

Starter Pen Meters St20T-A Specifications

Starter Pen Meters St20T-B Specifications