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Bluelab pH ProbePlus, Replacement Probe for pH PenPlus Bluelab pH ProbePlus, Replacement Probe for pH PenPlus Bluelab pH ProbePlus, Replacement Probe for pH PenPlus Bluelab pH ProbePlus, Replacement Probe for pH PenPlus Bluelab pH ProbePlus, Replacement Probe for pH PenPlus Bluelab pH ProbePlus, Replacement Probe for pH PenPlus Bluelab pH ProbePlus, Replacement Probe for pH PenPlus

Bluelab pH ProbePlus, Replacement Probe for pH PenPlus

Bluelab
Price:
$46.95
Contact us about commercial pricing
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Free shipping $49+ on most items

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Financing
available here

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Discreet packaging

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Have a question?
716-217-0353

Description

Fresh-probe accuracy for your pH PenPlus

The Bluelab pH ProbePlus is the genuine replacement pH and temperature probe for the Bluelab pH PenPlus. pH probes wear out with use, and when yours starts drifting or refuses to calibrate, this probe screws onto your existing pen body by hand, no tools required. It uses the same double-junction design as the original probe for stable readings in nutrient solutions, and it ships with a KCl-filled storage cap that keeps the glass tip hydrated between uses. Recalibrate after the swap and your pen is back to fresh-probe performance for well under the price of a new meter.

Fits Bluelab pH PenPlus No tools required Double-junction probe
Free shipping on orders over $49
30-day returns on all orders
Serving growers since 2006
Gallery
How to swap the probe
Side by side
Replacing the whole pen vs. swapping the probe
Buying a new pen
  • Pay full price for a new meter when only the probe is worn
  • A working screen, body, and battery compartment go in the trash
  • Set up and learn a new pen from scratch
  • Costs you a whole meter every time the probe wears out
Bluelab pH ProbePlus
  • Restores your pH PenPlus for well under the price of a new pen
  • Keep the pen body, screen, and settings you already know
  • Screws on by hand in minutes, no tools required
  • Same double-junction design as the original PenPlus probe
  • KCl-filled storage cap keeps the new probe hydrated
  • Keep a spare on hand so a worn probe never means downtime
Key features
Why swap the probe instead of the pen

Double-junction pH probe ±0.1 pH

Two reference junctions instead of one. The outer junction takes the beating from nutrient salts so the inner junction stays clean, giving you the same stable, accurate readings the Bluelab pH PenPlus is known for.

Tool-free replacement

Unscrew the worn probe from the pen body, screw the ProbePlus on by hand, and recalibrate. The whole swap takes a few minutes and needs nothing but the new probe and your calibration solutions.

Measures pH and temperature

The ProbePlus replaces both sensors in one piece, so your pen keeps reading pH and solution temperature (°C or °F) on the same screen, just like the day you bought it.

KCl-filled storage cap

Arrives with a storage cap filled with KCl solution. Keeping the glass tip wet between uses is the single biggest factor in how long a pH probe lasts.

Made for the pH PenPlus only

Built specifically for the Bluelab pH PenPlus with its screw-off probe. It does not fit the original Bluelab pH Pen, which has a fixed, non-replaceable probe.

Zero-downtime spare

A probe typically gives 1 to 2 years of reliable use with proper care. Keeping a ProbePlus in the drawer means you can swap and keep measuring the moment readings start to drift.

Specs
Technical details
Compatibility
Bluelab pH PenPlus only (not the original pH Pen)
pH Range
0.0 to 14.0 pH (with pH PenPlus)
Accuracy
±0.1 pH when calibrated
Temp Range
0 to 50°C / 32 to 122°F
Probe Type
Double-junction pH/temperature, replaceable
Installation
Screw-on, no tools required
Storage
KCl-filled storage cap included
Warranty
6-month warranty on the pH/temperature probe. Proof of purchase required.

How to swap in your new pH ProbePlus

1

Remove the worn probe

Unscrew the old probe from the base of your pH PenPlus by hand. No tools are needed, and the pen body, screen, and battery stay exactly as they are.

2

Screw on the ProbePlus

Screw the new probe onto the pen body by hand until it is fully seated and snug. Keep the storage cap on until you are ready to hydrate.

3

Hydrate and calibrate

Soak the new probe tip in KCl storage solution for 24 hours, then run a 2-point calibration with pH 7.0 and pH 4.0 solution. The pen confirms when calibration is successful.

4

Rinse, store, repeat

After each use, rinse the probe tip in clean water, then replace the storage cap with a few drops of KCl solution inside. This keeps the probe hydrated and extends its working life.

In the box
What you get, and what pairs with it
Included
  • Bluelab pH ProbePlus replacement pH/temperature probe
  • KCl-filled protective storage cap
  • Replacement probe only: the pH PenPlus pen body is not included
Recommended add-ons
Not sure which pen you have? The pH PenPlus has a probe that unscrews from the pen body; the original Bluelab pH Pen has a fixed probe and cannot use the ProbePlus. Call us and we can help you check: 716-217-0353 / help@happyhydro.com
Questions
Frequently asked questions
Only if you have the Bluelab pH PenPlus. The ProbePlus is made for the PenPlus, whose probe unscrews from the pen body. The original Bluelab pH Pen has a fixed probe that cannot be replaced, so the ProbePlus will not fit it. If you are not sure which pen you have, call us at 716-217-0353 and we will help you check.
The usual signs are readings that drift or take a long time to settle, and a pen that will not complete calibration even with fresh pH 7.0 and 4.0 solution. Before you replace it, try cleaning the probe with a Bluelab Probe Care Kit (pH) and recalibrating. If it still will not calibrate, the probe has reached the end of its life and it is time to swap.
No. The worn probe unscrews from the pen body by hand and the ProbePlus screws on the same way. The only other things you need are KCl storage solution to hydrate the new probe and pH 7.0 and 4.0 solution to calibrate it.
Yes. Every probe is slightly different, so your pen needs a fresh 2-point calibration (pH 7.0 and pH 4.0) with the new probe attached. Hydrate the probe in KCl solution first, then calibrate. The pen shows a confirmation when calibration is successful, and the 30-day calibration reminder takes care of the rest.
With proper care (rinsing after use, storing the tip in KCl solution, and recalibrating monthly), a pH probe typically gives 1 to 2 years of reliable use. Letting the tip dry out is the fastest way to shorten that, so always keep a few drops of KCl in the storage cap.
No. This listing is the replacement probe only. If you do not have a pH PenPlus yet, you can get the complete Bluelab pH PenPlus, which already comes with a probe installed, plus calibration and storage solutions.
If you receive a defective or damaged unit, email us a photo at help@happyhydro.com and we'll make it right immediately: replacement or refund, your call. For change-of-mind returns, we accept returns within 30 days for items in new, resalable condition. If you're not sure whether this product is right for your setup, call us first at 716-217-0353. We'd rather answer your questions before you order.
Happy Hydro has been selling growing equipment since 2006. We've carried Bluelab for years because the systems work great and customers who buy them leave happy. Have questions before you order? Call 716-217-0353 or email help@happyhydro.com. We're easy to reach and happy to help!

Your Happy Hydro Shipping Experience

We ship fast from Buffalo, NY. Most orders ship within 24 hours, and typical delivery takes 3-5 business days. Shipping costs are calculated at checkout based on the products and destination, with free shipping available on eligible orders. Plus, plain-box packaging and real humans ready to help if anything goes sideways.

Fast fulfillment — most orders ship within 24 hours
Plain-box discreet packaging
Serving growers since 2006
What to expect
When you order from Happy Hydro

Fast Fulfillment

Most orders ship same or next business day from our Buffalo, NY warehouse via UPS Ground or USPS Ground Advantage. Expedited options are available at checkout.
* Shipping costs vary by product, order size, and destination
* Some products are excluded from standard free-shipping offers or ship separately from a vendor's warehouse

World-Class Customer Care

Our grower support team is here 10 am-4 pm EST, Monday-Friday. Call 716-217-0353 or email help@happyhydro.com.

Discreet & Secure Packaging

Every order ships in a plain brown box with no branding or logos. Your purchase stays 100% private. We can also ship to your local UPS Store on request.

Specs
Shipping details at a glance
Delivery time
3-5 business days
Default carrier
UPS Ground or USPS
Signature required
Orders over $500 only
Shipping cost
Calculated at checkout Rates depend on the products, order size, destination, and shipping service selected.
International
Canada only Email help@happyhydro.com your address & a screenshot of your cart for a quote
Returns
30 days from delivery Return fee: $5 under $100; $10 + 10% at $100 or more. Live insects, soils, nutrients and used items are non-returnable. Full policy
Questions
Frequently asked questions
Shipping
Check the order confirmation sent to your email or phone after checkout — it includes a tracking link. If you use the Shop App, you can track your order there too.
Most orders ship within 24 hours, and typical delivery takes 3-5 business days after shipment. Expedited options may be available at checkout depending on the products and destination.
Signature is only required on orders over $500. For added privacy, we can ship to your local UPS Store so you pick it up on your own schedule — just ask.
We default to UPS Ground or USPS Ground Advantage. Select an expedited option at checkout and we'll use the appropriate carrier for that service.
  • P.O. boxes: Yes, for small and lightweight items.
  • International: Canada only. Email help@happyhydro.com your address and a screenshot of your cart for a shipping quote.
  • APO/FPO: Not currently available.
For Canadian orders, import duties and taxes are the buyer's responsibility. You'll complete payment using your tracking number at UPS.com when your package arrives.
Title and risk of loss pass to you once we hand off to the carrier, but that doesn't mean we leave you hanging. Email help@happyhydro.com and we'll work overtime to track it down and make it right.
Payment
We accept credit/debit cards, PayPal, Coinbase, and Happy Hydro gift cards. Your card is charged immediately at checkout.
Double-check your billing address and card number. For larger purchases, your bank may have flagged it — a quick call to authorize the transaction usually sorts it out.
Promotions
Enter your code in the "Promo code" box at checkout and click Apply. One code per order, but you can combine a gift card with a promo code if you have both.
Subscribe to our mailing list for exclusive discounts and early access to sales. You can sign up at the bottom of any page on our site.
Returns & Cancellations
Email help@happyhydro.com with your order number within 30 days of delivery. Returns must be approved before you ship anything back. Items must be new, unused, complete and in original packaging. Return fee: $5 under $100; $10 + 10% at $100 or more. Oversized, freight and multi-box items may be charged actual return shipping. Live plants and insects, soils, growing media, nutrients and other consumables are non-returnable. Wrong, damaged or defective item? Contact us with photos first — no return fee applies.
Refunds are processed through Shopify within 10 business days. Most customers see the credit back in about 5 days.
Reply to your order confirmation email or email help@happyhydro.com as soon as possible. Canceled orders may incur a processing fee depending on your payment method:
  • Credit/debit card: 2.9%
  • PayPal or Venmo: 3.5%
  • International PayPal: 4.0%
  • American Express: 4.1%
  • Shop Pay Installments / PayTomorrow: 6.5%
Support & Policies
Call or chat with our grower support team at 716-217-0353, Monday-Friday 10 am-4 pm EST. You can also email help@happyhydro.com any time and we'll get back to you quickly.
Your privacy matters to us. Read our full policy at happyhydro.com/pages/privacy-policy.
Why Happy Hydro

Why Buy From Happy Hydro

Happy Hydro began as a pipe dream in a garage and has grown into something built almost entirely on word of mouth and repeat customers. Rather than focusing on raising margins and obsessing over profits, we've always believed that the right combination of competitive prices, superior products, and world-class customer service speaks for itself. Our philosophy will never change: when you're happy, we're happy.

Our commitment
What you can expect from Happy Hydro

Real People, Real Growers

Our grower support team isn't a call center. They know the products because they're passionate about growing. Reach us Monday-Friday, 10 am-4 pm EST at 716-217-0353 or help@happyhydro.com, before you order or after.

Hand-Picked by Growers, for Growers

Every brand we carry was chosen by our founders because it performs. We only stock premium brands we believe in, and every item is inspected before it leaves our warehouse.

Fair Prices and Free Shipping

We work hard to keep our prices as low as manufacturers allow, and we include free shipping on orders over $49 so there are no surprises at checkout. Find a lower price anywhere and we'll match it.

Authorized for Every Brand We Carry

We're an authorized dealer for every manufacturer on our site. That means you get the full manufacturer's warranty on every purchase. No grey market, no expired stock.

30-Day Returns on Most Orders

Hard to commit to a product you haven't tried. Return most items within 30 days in original condition and we'll take care of it. Read the full policy.

Secure Shopping, Private Data

Every transaction is SSL encrypted. We don't store payment information and we will never sell your data to anyone, ever.

Volume and Commercial Pricing

If you're a commercial grower or putting together a large order, reach out before you buy. We have pricing available that we can't advertise publicly. Call 716-217-0353 or email help@happyhydro.com and we'll take care of you.

Questions? We're easy to reach.
Happy Hydro has been serving growers since 2006. Call or email our grower support team Monday-Friday, 10 am-4 pm EST, or email us anytime.

716-217-0353 help@happyhydro.com

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