Ohaus ST10 pH Pen Meter Waterproof 0.1 pH - Portable Tester

In this review of the Ohaus ST10 pH Pen Meter the bottom line is simple: this is a compact, no-frills tester for anyone who needs reliable pH readings on the go. The meter's slim, waterproof housing and straightforward controls make it a practical pick for field work, hobby labs, greenhouse monitoring or basic water testing. The auto shutdown and protective cap help preserve battery life and the electrode, so the device offers consistent performance without complex setup. For users who want a durable, portable meter that reads to 0.1 pH, the ST10 delivers.

Key Features

• Waterproof housing: The sturdy plastic, waterproof case allows use around splashes and light wet conditions without worry.
• Portable design: Slim pen form and integrated wrist strap make it easy to carry and test on location.
• Auto shutdown: Built-in auto off preserves battery life so the meter is ready when you need it.
• Protective safety cap: The cap shields the electrode during transport and storage to extend sensor life.
• 0.1 pH resolution: Provides straightforward, readable results suitable for routine pH monitoring tasks.
• Economical option: Starter pen meters are an affordable way to get accurate readings without advanced features.

Who It's For

The Ohaus ST10 is best suited to gardeners, aquarium keepers, educators and field technicians who need a reliable, portable meter for routine pH checks rather than laboratory-grade analysis. Its simple operation and protective features make it practical for outdoor or workshop use where convenience and durability matter.

Those who require advanced calibration options, laboratory precision beyond 0.1 pH, or integrated logging and connectivity should look at benchtop or higher-end portable instruments instead, as the ST10 focuses on dependable basic measurement rather than extensive feature sets.

Pros & Cons

Pros

• Waterproof, durable plastic housing provides real protection in damp environments.
• Compact pen form with wrist strap and protective cap makes for easy transport and safe storage.
• Simple operation gives quick, clear readings with 0.1 pH resolution for routine testing.
• Auto shutdown helps save battery life for sporadic field use.

Cons

• Designed as a starter pen meter, it lacks advanced calibration or logging features found on lab instruments.
• Resolution limited to 0.1 pH, so it may not meet needs where finer precision is required.

Specifications

Brand	Ohaus
Model	ST10 pH Pen Meter
Resolution	0.1 pH
Housing	Waterproof plastic, protective safety cap
Package Dimensions	4.064 H x 22.352 L x 6.604 W cm
Package Weight	0.55 pounds
Country of Origin	China

Our Verdict

The Ohaus ST10 is a solid, value-oriented pen meter for routine pH checks where portability and durability matter. It is a sensible buy for hobbyists and field users who want dependable 0.1 pH readings without complex setup, though those needing higher precision or advanced features should consider lab-grade alternatives.

Frequently Asked Questions

Is this meter waterproof?
Yes, the ST10 features a waterproof plastic housing designed to withstand splashes and light wet use.

What resolution does it provide?
The meter reads to 0.1 pH, providing clear results for routine monitoring.

Does it have auto shutdown?
Yes, the built-in auto shutdown helps preserve battery life between uses.