BluelabpH 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.

Great

Edit: company gave me a full refund without me even asking due to all the negative reviews people left and I could keep the pen. Top marks. 5 stars.My pen was so old that the solution had crystallized around the probe head. I soaked it over night and cleaned it up with the brush and cleaning paste. Glad I bought the cleaning kit.

Probe came out of the box reading 7.0 ... It does NOT work at all !! .... I contacted customer support. They sent out a replacement the same day. The new PH pen arrived and it works perfectly.. Really great customer service...

Absolute Trash!! I bought two of these too!! I followed the instructions to the tee. Soaked for 24 hours and still both would not calibrate. It would stick at 7 and never read anything else but 7. I watched YouTube videos and read the instructions 100 times. This product is trash and over priced.

Great meter. I hate to calibrate all the time, only one time a week with this one. It’s rite on time! Only wish the back light would stay on the entire time I’m using it.

**REVIEW REVISED AND RATED BASED ON CUSTOMER SERVICE EXPERIENCE NOT PRODUCT EXPERIENCE**I was initially excited about the Bluelab pH Pen Meter and Probe Care Kit, hoping it would elevate my gardening practices. However, the calibration process proved to be overly complex and frustrating. The instructions were unclear, and it felt like I needed a scientific degree to achieve accurate calibration.Unfortunately, despite numerous attempts, I was unable to get the meter to work reliably. It ultimately became a decorative piece in my garden rather than a useful tool. While the concept is promising, the execution falls short in terms of user-friendliness and accuracy.I’m revising this review to add that the customer service at Bluelab is exceptional. After sharing my initial experience with the product, the seller promptly reached out with solutions to address any concerns and ensure my satisfaction. This level of responsiveness is truly commendable. Based on this experience alone, I’m more than willing to give the company and its products another chance.While the initial experience with the pH Pen Meter was disappointing, Bluelab’s commitment to customer satisfaction has restored my faith in the brand. I’m hopeful that future interactions will be more positive.

Seems accurate enough just don’t let the top dry out.