Apera InstrumentsAI102G GroStar Series GS2 Soil pH Pen Tester Kit for Direct Soil Test and Nutrient Solutions Test with Replaceable Swiss Spear pH Probe, Gen II

I’ve had this Apera Gro Star since June 2024 it still works the same as a did the day I purchased it it’s very accurate and easy to recalibrate the lifespan on this is between 18 and 24 months on the tip it is replaceable and mine still showing 97% this company built great product. I recommend it.

So far this meter has been working great! We had some huge pH issues with our soil and have been working to try to remediate it. It has been great to have the Apera pH meter to be able to test all of our soil. I am hoping that the meter lasts a long time and continues to help us keep our garden soil, healthy, and balanced correctly!

Perfectly calibrated out of the box. The pH meter is incredibly accurate and agrees with pH paper test strips! I had purchased another Apera meter (Apera Instruments AI311 PH60) thinking that I could use one of those cheap meters for EC but it was inaccurate and junk, wouldn't auto shut off and was a total waste of money and time. I had already wasted time and money on the cheap pH meters that were awful to calibrate, used expensive small button batteries, did not shut off automatically so it was 1 reading and new batteries if you don't shut them off. By mistake, I purchase 2 identical cheap pH meters and they won't even agree with each other for pH or EC and they don't agree with either of the Apera meters (both of the Apera meters agree perfectly on pH) or pH paper test strips. I don't have any thing to compare the EC meter with but from my experience with the pH portion, I would expect it is extremely precise and accurate.Would be nice if the GS4 came in a similar case to the PH60 instead of a cheap cardboard box that won't last.

Great product of excellent quality and a competitive and affordable price, it works like a charm 👌

I bought a GS4 more than a year ago. I can't remember where I bought it so I can't pen down exactly when I bought it, but I suspect I've been using that first one for a couple of years at least. I bought this second one from Amazon as a back-up to the first one.A few months ago, because I am an expert at all things electronic, I put the batteries to the first one in backwards. In just a few seconds the whole thing heated rapidly. Very hot. Very rapidly. I happened to be holding it at the time, and I can attest to this.I rely on the results I get from the GS4, and I was relieved to see that once cooled, it calibrated as always and returned consistent results within tolerance. Your mileage may vary. I bought this second unit from Amazon as insurance against any further operator error.What spurred me to go ahead and get another just in case is that realized how much I depend on this pen. I spent way too much money trial-and-erroring my way to this meter. I suggest anyone who buys this pen to get qt bottles of standard solutions (4,7,10, 2.7), a qt of cleaning solution, and a pt of KCL. They're relatively cheap at that size, and cleaning/calibrating/storage becomes almost economical. This is a dependable, reliable instrument that's worth the trouble and expense of maintaining it.

The media could not be loaded. Amazon shipping, not bad, 7 days.The GroStar GS4 is a fantastic all in one pen that I'm absolutely loving. I have always used 2 pens to get my ph/ppm readings which was a bit of a pain juggling & maintaining them both constantly. Now with the GroStar everything is a click away while reading temperatures at the same time too. *Long press bottom button to switch from Ferinheight to Celcius. One of the great features I really like about this Apera pen is you only have to relace the probe when its expired not the whole pen! Good engineering!The screen is bright and easy to read and understand. Calibrating the whole pen takes about 90 seconds tops, its very easy. I have uploading a quick video of how easy it really is. I see some user error in some of the problems some people are having.The GS4 is quality, It's a great value for what you get Imo.Great job with this new GroStar lineup 👍👍I would recommend this pen all day long to all growers, give it a try, I think you will be happy👍🍅🍅🍅🍅🍅

So a little over 2 months and the meter starting getting wonky, I tried to recalibrate but the 4.0 never completed successfully. Waste of $$$

This all-in-one tool was exactly the thing I needed to ensure my hydroponic gardens were thriving and productive. The device is easy to use and to maintain, and it comes with clear instructions, helpful videos, and safeties to make sure you don’t smash it on your first use. It’s durable. Thanks. It also comes with batteries installed, which was a surprising little perk. I appreciate that when the time comes to have to replace parts that this device is well-considered for the ease of reuse and the economy of parts that will need to be disposed of later. Works well, long-lasting value, intuitive, easy to keep. It’s ideal. I recommend it.