Bluelab pH Pen Meter and Probe Care Kit pH with Calibration Supplies, Storage Solution & Brush, Reliable Digital Tester for pH, Temperature in Growing Solutions, Optimal Plant Health and Yield

2/18/25 Update: BlueLab reached out to me to resolve the issues I was having. They ended up sending me a new pH pen and shared some information on a few things worth considering. My new pen arrived and the storage cap was still moist with storage solution (this is a good thing). The new meter does work better than the original one, but I also suspect that my tap water has "low ionic content" which can cause pH readings to drift (this was also mentioned by BlueLab in their communications with me). I have found that the first readings of the day with the BlueLab pH pen can be a bit low when checking tapwater at my house. If I add nutrients to the water, the pH readings are much more definitive and easy to take. I believe this is to do with the ionic content. I experienced similar behavior with some other, cheaper pH meters. The BlueLab pen reads the calibration solutions quickly and accurately. My advice to anyone new to and/or serious about measuring pH, buy yourself some pH drops (General Hydroponics sells an affordable kit) so you can definitively measure your pH using a visual color matching method and compare to your meter readings. I found that the drops worked the same every single time without error or question or waiting and gave me more confidence in working with electronic pH meters. With some experimenting, I was able to figure out how to get repeatable and accurate readings from the BlueLab pH pen; Sometimes getting a reading of my tapwater that I am confident in takes a few tries. Why get a pen if drops work so well? The color shades when using drops are distinguishable between 6.0 and 6.5 for example, but identifying in between can be difficult to judge. The BlueLab pen gives me 0.1 resolution/accuracy that is needed when doing hydroponic gardening. Having both ways to check pH is ideal. I suspect that pH pens are generally not terribly expensive to manufacture, but it is costly to have a support team available to reach out to communicate with and help customers with their products. Ultimately, BlueLab came through with service, something that is rare these days. I appreciate this and have raised my rating to 5 stars. I really like the BlueLab pen cap, with the sponge that keeps storage solution on the bulb, and the rope used to connect it is also helpful when taking pH samples in a bucket. I do however, wish the the base of the cap was a bit wider so the pen could stand up on its own more reliably. I also wish the meter displayed down to 0.01, not because I need more accuracy, but because I want to see what the current measurement trend is doing (going up/down). The auto off timer also feels a bit short, but I suppose that is both good and bad. 1/10/25 (Original Review) I really wanted to like this expensive PH meter. Sadly It came with a dry probe so I soaked it as directed for 24 hours. Calibrated it 3x with Bluelab 4 and 7 solution but readings would drift for several minutes after each calibration. Tap water would measure at 6.4 right after calibration but leaving the pen in the same sample of tap water the reading would drift up to 7.5 after several minutes. It would never read the same value twice. Just a few minutes after calibration it would read the calibration solution several tenths lower than it should. I bought this expecting accuracy, not games. Returning.

Everthing works perfect blue lab for the win

01-12-26 I have been using this Bluelab PH Pen since December 2023 and it is still working great, I dip it in clean water after every each use keep the tip wet so it doesn't dry out. I feel comfortable knowing the readings are true and my hydroponics are thriving.

The first one didn't work. But customer service replaced it quickly. The Second one works perfectly.

Extremely disappointed. Worked ok for the first couple months but after less than 6 months was absolutely useless. Took great care of it since it was so expensive and it still couldn’t even work for 6 months. Blue lab is supposed to be quality SMH

use it all the time. some variance here and there. but still a great choice. ,,

Excellent, PH meter. From some of the reviews. I assume they don’t read the directions. I would suggest getting the combo pack that comes with KCI solution and calibration solution. Inside the cap is a tiny little sponge. Make sure you don’t toss that out thinking it’s the KCI solution hardened. If you notice salt residue on your probe when you open it up, simply follow the directions and make sure you soak it for 24 hours in the supplied KCI solution before calibrating and using. My probe was completely dry and rewet no problem. It reads very fast, which is convenient.

It delivers fast, accurate pH and temperature readings—crucial for healthy plants, especially in hydroponics. The pen is well-built, waterproof, and easy to use, with a clear digital display. What sets this kit apart is the included Probe Care Kit. It comes with calibration solutions, storage solution, and a cleaning brush—everything needed to keep the pen accurate and long-lasting. Since I started regular calibration and cleaning, my readings have stayed rock-solid.

Muito bom

The calibration solutions come in little sachets. Easy to operate.

Sehr zufrieden. Genaue und schnelle Messungen.

Fast shipment but dry sensor, got to check if its still working

les solution de ph 7 et 4 sont elles réutilisables ?? et une fois ouverte comment on entrepose ça un sachet ouvert tres mauvais contenants pour les solition , des sachets je trouve ?? pourquoi pas des pots avec couvert bien mieux. et moi aussi on dirais quel avait deja été utilisé, il y avait ce qui semblait être du tartre dessus déjà mais j'ai acheté neuf !?