I ordered them. 
Those are the same ones I buy and use. they’re fairly good. You might need to replace every couple years, but hell… for the price and performance they’ll do.
Just do the calibration when you first get them and check now and then. Other than that all you need do is ‘zero’ em in before use.
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I love my blue labs, went a few years constantly replacing, then I bought my blue labs…. Have never looked back, that was 7 years ago, only think I’ve had to replace was the ph probe on my main unit for my Rez and my epicentre.but that was my fault. I always push blue lab for accuracy and life.
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I’ve had the Vivosun ones go for up to 6-7 yrs without replacing and also had to replace em within couple years. It’s all in the treatment lol I dropped one in the water, and even after trying to let it dry out, it wasn’t any good.
Other than having to replace the battery occasionally, all good as a general rule.
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Normally I would go with the $250 Blue Lab ones…but I will try the $30 Amazon ones.
Should get here tomorrow.
Whatever works and is within budget that’s what matters if it gets the job done, perfect…. I just threw to many away for inaccuracies and other issues. Then said to myself what were u thinking ? My rule of thumb is generally buy once. No stones in this glass house
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I have those and the blue lab.
The cheaper ones read the same as blue lab after 1 1/2 years of using them
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I just use the strips, so a digital read out will be nice. 
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The ones you have should do you nice!!Just make sure to calibrate them right with the powder provided ,I messed up on the first one and had to order new powder but now the thing is pretty much dead accurate give or take .1-.3
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you can get the liquid calibration instead, it doesn’t mess up so easily.
I have used the GH set of calibration liquid but this last time i bought some of this stuff, it works nicely also.
But that’s because i like to check the calibration at least once a month , other than that I just zero it out before i use each day
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Yo @JohnnyPotseed
Hope you and the Missus are staying safe and warm. They say this storm coming in is gonna be a booger.
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you know it cuz! now they’re saying over 6", lol last night it was 4-6
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Oh, Hell, I better go get some fresh petrol for the Generator in case we lose power.
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Hey @chronix , I use this one, it’s by Apera, has replaceable probes and comes in a kit with 3 calibration solutions and storage solution. Works great.
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Has anyone here bought and used the driver extension chords to be try and get the drivers out of the tent to cut down on heat? Not an issue for me at the moment, just been thinking about changes I may want to make for when it heats up over here. I will try pumping some colder air into the tents if I can get it set up, but some of these drivers get cooking.
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I thought @ReikoX and @Mr.Sparkle both have their drivers mounted externally to the growspace. I’m sure there are more members than those two, but that’s just what came to the top of my head.
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I WANTED to get them but don’t trust the builds i’ve seen when i do find them.
If i did i could that the 4x drivers off my 2x TSL-2000’S and build a heat box venting straight out the window
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i was just cleaning my tent and stood up only to hit my head on the damn sheet of glass in my reflector. i’m glad it didn’t break. sure sounded like it.
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Be glad you didn’t tattoo your scalp with a bulb lol 
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That would tickle a bit. 