Im am unsure how to calibrate that pen. I will do some searching to see what i can find tho. It should have came with calibration instructions tho 
My 1 cherry tomato plant i grew this year
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Ok mix the 4.0ph solution in just enough Distilled water to take a test.
Turn on pen, put in water, wait for pH pen to stabilize, hold the calibration button until you see the digital display blinking 4.00 keep holding the button until the display screen stops blinking and holds stable at 4.00. take out, turn off, wipe clean, calibration complete.
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Okay how much of the 4 solution do I add though? To the water or how do you do it?
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Mine didn’t come with liquid bottles. Mine was to packets. Um maybe a pic of the 4.00 bottle label front and back could help us both
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And this is the box. It’s the only label on it lol a there is nothing on the Amazon page about using it to calibrate lol 
damn
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any perlite?
Any other additives?
Soil slurry or runoff measured?
Same here. Looked good and reasonable.
Resides my junk pile with the other useless stuff.
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None of it no. What do you think?
DDD has an affinity for water.
I tend to overwater, most always.
the FFOF/HF combo is better than straight FFOF.
Bags are better for “soil root breathing” IMO.
lifting to determine water need is recommended.
I just can’t lift big pots, anymore.
water less is always good for me.
My current soil is similar to FFOF.
Pre-charged for 3-6 weeks, of initial growing.
Getting soil run0ff to 6.5/1000 requires monitoring and feeding accordingly.
Good growing to you.
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Apera and YT have videos for how to calibrate.
Congrats on the seedlings living, that is an accomplishment.
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Same 
So you would say water this week and next week add some nutes? I water on Sundays!
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What numbers for feed and run-off did you last get?
3-weeks seedling in soil? What kind of soil mix?
FFOF/HF probably should need 6.2 IN water.
PPMs will be running high for a couple more weeks, before PH/PPM crash or change.
My soil is date/response similar to yours and has been shifting from above 7.0/2500 to 6’s/1500’s (towards 6.6/1200), for me and my grow plants.
Have you watered to run-off (IN/OUT measured)?
That will determine “Need for Feed” or adjusting PH.
Sadly I bought more than one, just for “back-up/comparison”.
Just More junk, with “free shipping”.
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Yes I did and I’m using the fox farm ocean forest and happy frog. 50/50 mix. My ppm came out 1-2000 ppm and maybe over and my ph was roughly 5.8 ish. Not sure if I’m using my tds pen correctly or if it’s calibrated.
You can look above for the ph and pens I use
Sad to say, I have triples of those, in the junk pile.
I have just spent an hour trying to calibrate my PPM meter(s).
The Apera 20 didnt survive a month vacation and some fungus removal efforts, but may be revived at a later date.
The Aper 60EZ, calibrated perfectly (as always).
@Caligurl posted on forum information supporting my PPM/TDS meter calibration requirements. Solutions and support videos have not worked, until today.
Somewhere, I missed reading, or they never said, was the step needed to get the PPM calibrated, correctly. My analysis or take-away, would be when using the 1413 Calibration solution for standard setting, the PPM device requires depressing the calibration button and initiating the CAL sequence of flashing.
The instrument then goes “bonkers” (technical term, trust me), spinning thru numbers and quits somewhere. If the spin was good, instrument Calibrates.
Else, REQUIRED USING the UP/DOWN button to correct instrument into reading the 1413, correctly and completing the CAL sequence.
Shout out to @Caligurl for the posting assistance.
She got me on the 1413 and the TDS/PPM meters. Both (-5/-7) calibrated today.
I might actually to calibrate some of the junk pile residents.
The new Apera TDS20 is to be shipped soon.
your line above could be read and
Interprets as Over-range on PPM (above 2000 range of meter) and at 5.8 PH (as in starting PH adjusting).
PH, then PPM fix order, IMO.
Test the next run-off of 6.5 water, no adds.
@Lostgirl posts on forum Soil & Measuring/adjusting support.
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Not sure i understand this statement. How did you get a reading of 1-2000?
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So when I flushed my plant my TDS came out as 1000-2000 ppm so it made me super concerned and hits why I replanted in new soil.