Bluelabbluelab pH Pen - ± 0.1 pH Accurate, Durable Double Junction Probe, Waterproof & Floats, Auto Temperature Compensation, Easy Calibration - Made in NZ

First let me say DO NOT be discouraged from the one star reviews. I can understand someone being upset if they buy a new pen and get one that’s broken but if that’s the case none of us would ever own anything. It is absolutely impossible to buy anything that doesn’t have a bad review because of something that in many cases that has absolutely nothing to do with how the product works, go look up anything you own and love and someone had an issue, seriously go look and see, I’ve tried it there is nothing I’ve found that everyone loves. This pen is awesome if you are a grower and ph is vital and you want to be a next level grower. I’ve had mine 2 years and when it stops working I will immediately get another one. It does take a small bit of little effort to add a few drops of storage solution that you have to buy extra but that last a long time and it’s worth it to me. You add it after each use to keep it hydrated. If it dries out the pen is not ruined like some say but you might have to recalibrate which is easy after your first few times, especially with the step by step YouTube videos available to watch while you’re doing it. Just remember there are a lot of lazy incompetent people out there that all they want to do is push a button and be done with it and expect everything to be instant and do nothing else. It all comes down to how important ph means to you and it is very important to me. This pen is accurate and it’s awesome and requires very little effort to maintain and it has helped me take my growing to the next level. It also works great with my pool to, way better than those test strips they have that do work but not quite as accurate as this ph pen. Thousands of top growers use this pen and depend on it, you see them on YouTube all the time using it. I happened to run across the reviews looking for something else and wanted to see what the hater’s were saying and now that I’ve used the Bluelab pen a couple of years I felt I could give a genuine review based on my experience with it. So, now it’s up to you to decide. Good luck!

Love my blue lab have used for years easy calibration and accurate. Buy the calibration and storage solution to maintain this product and have great long term use. The led screen is easy to read and displays water temperature. Functions fantastic

It’s a little tester. Here is really good. I’ve liked this. I bought a lot of them and I found out so far. This has been the best one I got.

Excellent

Seriously save your money. I keep seeing this pen routinely recommended for some reason as it was to me and decided to write a review to at least save some people some money. Stop buying this overpriced pen!! Its insane what this costs now. I admit I am bitter about it as I truly feel I got ripped off.I run two hydroponics gardens and two aquascaping fish tanks, both with pH sensitive shrimp species. I also run C02 to the fish tanks to help grow the plants, which lowers pH throughout the day. In fact, one of the ways to tell what your C02 concentration is by the relationship between pH of the water and KH (another test), but my point is simply that pH is important to me, and I am just mentioning it to prove I know a thing about water chemistry to say the least.This Bluelab pen is slow to respond at best, but totally way off at worse. Even after calibration it just can't be relied upon to give me accurate numbers. I use a cheapo pH meters and those give me consistent and accurate results. You can buy 5 of those and get better results than this pen gives! Better yet, at least on the aquariums I also use a basic API pH test kit, (where the water color changes based on PH) and again side by side the accuracy of that is hands down better than this pen.Is it possible I just got a bad pen? Maybe. I am aware of the "rules" on the pen - do not let it dry out, store the bulb in the proper solution, rinse it well before using, and pro tip - make sure to tap it so any air bubbles in the bulb float up and do not impact results. But even through all that, it calibrates fine, leads me to believe it will work and then goes wildly off. It cant be trusted. I do not like to write bad reviews but between the cost and my experience I am just hoping to help others. Go buy the $15 ones.

I have been using these for over 10 years so I know how to use it. It’s just stuck at 7.0 no matter what. Calibrated 2 times. Nothing. The one I bought over an year ago also stopped working so now I have just purchased a third one so I can return it and if this one doesn’t work, I’ll never use blue lab again unfortunately! Update. Blu lab returned my money. They still have me as a customer.

This pen cost double than any other pen on the market, yet it broke in under 3 months!? This is a joke, they say in the video that it can take some rough use and I barely even submerged mine in water. Also it is funny that you have to get the storage solution, cleaning kit, and various other things to actually keep the pen in function. I am looking to return as this is one of the biggest let down I have had with growing, I have to pH my water tonight and I am in a bad place, also I don't know how long it has been un-calibrated. This could have cost me months of work, very disappointed.UPDATE: The pen is working great now and able to easily calibrate and measure the pH pen. I still hold some of my initial feelings about the additional products being needed to make this pen work but it really does a good job.Update: I was able to get a complete replacement with returning the pen. The replacement has seem to keep up and requires high maintenance but seems to be keeping good.

I have purchased this unit twice so far. Once in 2009 and again in 2018 and it looks like the end is near for the 2018 unit. Rarely needs calibration and really a pretty good meter. Hard to justify the price until you spread it out over 6-9 years, eh? I'll buy it again.