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Bluelab pH pen with digital display showing 5.2 pH and 70°F, white and blue design.
Bluelab pH pen measures 5.7 pH and 20°C in dark water, held by a hand.
Bluelab pH pen with digital display showing 5.2 pH and 70°F, white and blue design.
Bluelab pH pen measures 5.7 pH and 20°C in dark water, held by a hand.

Bluelab pH Pen - Waterproof pH & Temp Meter

Official Bluelab Dealer Model: PENPH
$99.00$89.00$99.00
 $99.00
starting from 0% interest financing from /mo.

Payment Options

Options:Pay in Four, Pay Monthly
Amount:Up to $1,500 (Pay in 4)
Up to $10,000 (Monthly)
Schedule:Bi-weekly to Monthly
Term:6 weeks, 12 or 24 months
Interest:0% to 35.99% APR*
Credit Check?Soft Check Only
Schedule:Bi-weekly to Monthly
Term:6 weeks, 6 or 12 months
Interest:0% to 35.99% APR*
Credit Check?Soft Check Only
Finance up to:$4,000
Must apply on a desktop device.
Schedule:Flexible
Term:Up to 36 months
Interest:Processing fee + interest
Lease-to-Own?Yes
Amount:$500 to $10,000
Looking to finance equipment under your corporation? Learn more about Business Financing
  • Measurement range of 0.0 to 14.0 pH with 0.1 resolution
  • Waterproof design floats in nutrient solution instead of sinking
  • Uses a single AAA alkaline battery for power
  • 1-year limited warranty
  • View More Details

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Mon to Fri, 9am to 5pm PST

Call (360) 800-5535
  • Free Shipping On Most Items*To the lower 48
  • Transparent PricingBacked w/ price match guarantee
  • 4.8/5 Top Quality Store on Google
  • Secure CheckoutSSL encrypted payments

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THROUGH THE Cultivator's LENS Highlights

  • You are checking your nutrient solution pH levels because fluctuating acidity causes your plants to stop absorbing nutrients.
  • You are looking for a reliable meter because your current methods are guessing the balance in your reservoir.

  • The double-junction probe design delivers consistent readings because it resists clogging and contamination.

  • Users who keep the probe hydrated with KCl solution say they avoid the drift issues that ruin cheap pens.
  • Growers who switch to this model report that they stop wasting time on inconsistent hand-readings.

Bluelab pH Pen - Waterproof pH & Temp Meter

Grabbing an accurate pH reading shouldn't require a full lab setup. The Bluelab pH Pen delivers fast, reliable pH and temperature readings in a compact handheld design, helping growers keep nutrient uptake on track without slowing down their workflow.

A double-junction pH probe drives consistent accuracy, while a bright backlit display keeps results easy to read in any lighting. Simple 2-point calibration with a built-in 30-day reminder keeps the pen dialed in over time, and a fully waterproof build means it floats rather than sinks if it ends up in your reservoir.

For growers who want a complete measurement system, the pH Pen pairs naturally with a Bluelab Conductivity Pen—or you can find both together in the Bluelab pH and Conductivity Starter Pack. For those seeking advanced features, the Bluelab OnePen offers 3-in-1 pH, EC, and temperature testing with Bluetooth connectivity.

Features

📱
Compact Handheld Design

Sized for convenient one-handed use anywhere in the grow room.

💡
Backlit Display

Bright, easy-to-read screen keeps readings clear in any lighting.

🔬
Double-Junction pH Probe

Delivers accurate, consistent pH measurements reading after reading.

⚙️
Quick 2-Point Calibration

Built-in 30-day reminder keeps the pen accurate without guesswork.

🌡️
Dual Temperature Units

Reads temperature in °C or °F to fit your preferred workflow.

🛟
Waterproof & Floats

Fully waterproof build floats in any solution instead of sinking.

What's Included

Specifications

Specification Value
pH Range 0.0–14.0
pH Resolution 0.1
pH Accuracy (at 25°C / 77°F) ±0.1
Temperature Range 32–122°F (0–50°C)
Temperature Resolution 1°C / 1°F
Temperature Accuracy ±1°C / ±2°F
Operating Environment Nutrient solution, 0.2 EC and above; 32–122°F (0–50°C) — do not use or store outside this range
Power 1x AAA alkaline battery

Support & Manuals

Warranty

The Bluelab pH Pen is covered by a 1-year limited warranty.

Frequently Asked Questions

Does the Bluelab pH Pen require calibration? +

Yes, but it's quick — a simple 2-point calibration, with a built-in 30-day reminder so you always know when it's due.

Is the pH Pen waterproof? +

Yes. It's fully waterproof and actually floats if dropped in a reservoir, rather than sinking.

Can the pH Pen read temperature too? +

Yes. It displays temperature alongside pH, and you can switch between °C and °F.

What's included with the pH Pen? +

Each pen ships with single-use pH 7.0 and pH 4.0 calibration solution sachets and a KCl storage solution to keep the probe ready between uses.

What temperature range can the pH Pen be used in? +

It operates and reads accurately between 32–122°F (0–50°C). Avoid using or storing it outside this range.

What's the difference between the pH Pen and the pH PenPlus? +

The pH Pen has a fixed probe, while the Bluelab pH PenPlus features a screw-cap replaceable probe for easier long-term maintenance.

Happy To Help

Questions About This Product?

Our specialists are happy to help. Call us or send a message and we'll get back to you within one business day (most of the time within a few hours.)

Call (360) 800-5535

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