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For what purpose? You can send a plastic bottle to Ward Labs and they will have results to you in a few days. You can grab a cheap TDS meter on Amazon if you just want to know how the RO system is working.
I use this EC meter. Unlike pH meters, the cheap ones are probably generally fine, because the electroconductivity of a solution is much easier to measure with electronics than pH.
I am a new grower — just harvested my first plant last night — and I nearly lost it at the start because the pH meter started giving incorrect readings. I was using it in my DWC setup and it was reading ~6.0. I noticed yellowing of the leaves, so I did some triage, ensuring nutrients were not too strong or too weak. By chance, I decided to double check pH with a chemical reagent. pH was down to ~3.5! So I bumped up the pH using the chemical reagent. I ordered another yellow stick and ordered one of these: https://smile.amazon.com/gp/product/B07KQ3X5PR/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
I don't trust the yellow stick. Even the new one started going wonky on me. I have had the best luck using the continuous meter and periodically cross-checking with the chemical test.
Plant obviously recovered, but never getting one of those things again.
Water Quality Tester, Accurate and Reliable, HoneForest TDS Meter, EC Meter & Temperature Meter 3 in 1, 0-9990ppm, Ideal Water Test Meter for Drinking Water, Aquariums, etc. https://www.amazon.com/dp/B073713G5F/ref=cm_sw_r_cp_api_glt_fabc_PRQ4QDXY0ZVKP6QF3CJ8 Save yourself a headache and get this. It will make you a much better grower. You will be able to feed the plant correctly and be able to adjust as needed
The pH of your water can be important for some plants as is the temperature. I imagine you know where to find a thermometer but you can get a cheapo tds meter on amazon for like 15 bucks. https://www.amazon.com/gp/product/B073713G5F/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Acho que nessa faixa de preço só a Edifier mesmo https://www.amazon.es/EDIFIER-Studio-R1700BT-altavoces-Bluetooth/dp/B00MXY21LW
Strange, your numbers look fine. 1400 ppm run off is a tad high, but shouldn't cause burning... however burnt tips + dark green leaves almost always means you need to back off on the food. EC meters are cheap. I'd order another in case yours is reading low. I've been happy with this one.
are you dead-set on computer speakers, or are you willing to upgrade to something a bit more substantial?
the suggestion I leave often is to get a Lepai amp and the cheapest bookshelves you can find on Amazon. I don't know what online stores Poland has, but I'm assuming you can order off of amazon.de
powered monitors are another option, which combined the simplicity of computer speakers with the sound quality that bookshelves provide. this seems to be a decent pair in your budget, but due to the language barrier, I'm having trouble navigating the german site
Both of those options are way over the stated budget. For under £200 with BT those ones listed look decent. Really the only other option Ive seen that fits this criteria is this https://www.amazon.co.uk/Edifier-R1700BT-loudspeaker-loudspeakers-Built/dp/B00MXY21LW/ref=sr_1_1?ie=UTF8&qid=1495722982&sr=8-1&keywords=edifier+r1700bt
Cheaper than the Roth's but wont have all the connection options or likely the same sound quality. I would try the Roth's. If you dont like them you got them from Amazon so easy return.
I got this one off amazon. Haven't really done extensive calibrating but it reads low in spring water and high in my tank water so...it seems good enough to give a ballpark reading.
At this stage, they don't need much in the way of nutes, so the soil is likely too hot. Measure the EC/ppm of the run off. Anything above 500 ppm is too much.
12" for the lights should be fine; they don't need much light when they are vegging. I doubt you are over doing it with 32 W.
If these are not autos, then the ones that are flowering will need to re-veg. This could take a few weeks under 18/6. If you have more seeds, it might be quicker to replant.
Generally it’s 1-3 teaspoons a week per gallon of water but it depends on plant uptake if it’s a recirculating system. To you have an EC monitor? Here is a cheap one I’ve used before Water Quality Tester, Accurate and Reliable, HoneForest TDS Meter, EC Meter & Temperature Meter 3 in 1, 0-9990ppm, Ideal Water Test Meter for Drinking Water, Aquariums, etc. https://www.amazon.com/dp/B073713G5F/ref=cm_sw_r_cp_api_fab_wFDGFb8QPR1P4
You could monitor the actual reading fluctuations and change your variables based on that over visual of the plant.
In general with a smaller tank you may need to flush the nutrient tank once every 2 weeks or month and start with fresh water and nutrients.
The EC reading will tell you the total conductivity of the salts in the water but it won’t tell you what nutrients are there. For instance the plant could be eating mostly nitrogen but leaving some of the micro nutrients. Your ec reading looks fine but if you did the extra step of getting a nutrient analysis test done you’d find that the water has a good ec level but is jam packed with sulfur.
They are reusable, I had one like this: https://www.amazon.com/Accurate-HoneForest-Temperature-0-9990ppm-Aquariums/dp/B073713G5F/ref=mp_s_a_1_3?dchild=1&keywords=water%2Bmineral%2Btester&qid=1600387116&sprefix=water%2Bminer&sr=8-3&th=1&psc=1
You can also get a kit like this which is handy:
You need to get a TDS meter.
This one from HM Digital is what I have, costs ₹795: https://www.amazon.in/dp/B007KDYOMU/
You can get this one from Xiaomi @ ₹349: https://m.store.mi.com/in/item/3192900018
Use time foil or tape even cardboard around the stems. You can plant whenever if you monitor nutrients in water. Get a tds meter keep around 600 or so and plants will thrive.
Here is a cheap one that works well for me. You can plant as many plants as you want as long as they have nuts to eat
https://www.amazon.com/dp/B073713G5F/ref=cm_sw_r_cp_apa_i_VJkjFb3EE291V
Get a good one, plan on spending $100+. They are worth it, they're so useful and ensure safety.
The pH meters with replaceable electrodes are nice. Bonus if you can get one with a temperature meter as well, as measuring the pH and temperature simultaneously will give you a more accurate result - pH can vary with temperature and a temp probe compensates for this.
Electrodes wear out over time, so if the electrode is built into the meter, you'll have to ditch the whole thing. This is why replaceable electrodes are nice.
Electrodes that are stored in a KCl storage solution are ideal, and increase the lifespan of the electrodes.
You'll want to also purchase buffer solutions, and storage solution. 7.01 and 4.01 buffer solutions, and storage solution. You can use distilled water to clean it between readings/calibration.
Calibrate it every day you use it.
EC, TDS, and ppm meters are different names for the same thing.
I previously used this one, and replaced it with this one when the battery glued onto the cheap one's circuit board died. Those two meters disagree, the new one seems to be much better at taking the temperature of the solution measured into account, and in general it seems much better made. I picked that one because it was what my local hydro store had, but I've been much happier with it, and I can actually replace the batteries when they run out.
I use this cheap 15$ TDS meter. Here’s an Amazon link https://www.amazon.com/Accurate-HoneForest-Temperature-0-9990ppm-Aquariums/dp/B073713G5F/ref=mp_s_a_1_3?crid=3OL0NCUTVLY0I&keywords=tds+meter&qid=1665317274&qu=eyJxc2MiOiI0LjcxIiwicXNhIjoiNC4xMCIsInFzcCI6IjMuOTEifQ%3D%3D&sprefix=td...
Get one of these water quality testing PPM meters: https://www.amazon.com/Accurate-HoneForest-Temperature-0-9990ppm-Aquariums/dp/B073713G5F/
According to the EPA secondary drinking water regulations, 500 ppm is the recommended maximum amount of TDS for your drinking water. Any measurement higher than 1000 ppm is an unsafe level of TDS. If the level exceeds 2000 ppm, then a filtration system may be unable to properly filter TDS
If you get some shrimp mineral rocks, a cuttlebone, crushed coral, or something similar that should balance out the negative buffering the active substrate is doing.
For GH/KH you can easily manage that by using a TDS meter ($14) to check your total dissolved solids, doing your water change using reverse osmosis / distilled water, and using a shrimp specific mineral mix to bring the TDS back up to what it was before the water change.
So long as the TDS isn't off from what it was for mare than ~20 minutes you will avoid any shock to the shrimp.
The meter reads instantly so it's MUCH easier than doing individual GH and KH tests, and using a pre-mixed mineral ensures that the exact ratio is already taken care of.
Thanks man!
I completely gave up on soil. The weeds and pests in my area are too insane.
I guess I'll splurge the $15 and get one of these
however in the meantime. I guess its fine to just leave things as they are. Honestly this is me at the moment
I have a basic, cheap water quality testing kit and it does a pretty good job at gauging the potability of water. If you want something that can go deeper, there are more elaborate versions. Purifying dirtier water isn't something I have personal experience with, but there should be lots of other people who can give you expert knowledge on it.
Get a TDS meter and use a GH+/KH+ to bring up the TDS to 220-300 PPM.
The pre-mixed minerals will keep everything in the correct range as long as the TDS is right.
That will be great for Neocaridinas.
Also when you do a water change make sure the water is the same temperature as the water in the tank, has no chlorine, and the TDS in the tank before the change matches the TDS after the change.
Rapid changes in TDS (if they aren't quickly corrected) will cause osmotic shock which can be fatal.
EC meter: https://www.amazon.com/gp/product/B073713G5F/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
PH meter: https://www.amazon.com/Waterproof-Accuracy-Suitable-Testing-Replaceable/dp/B01ESYG6B0
Not sure what you mean by waterproof. You can place them in water to get a reading, but I don't think that you can leave them permanently submerged.
That's how I felt when I purchased this after using a friends. Best investment ever.
Sure. So ppm is parts per million of “substance” in the water, other than water. Since you’re just putting nutrients into your water, you can measure the concentration of nutrients by using a ppm meter.
So instead of just following the “two caps every other week or whatever, you keep your nutrients at a level appropriate for the plants you have in there.
TDS Meter Digital Water Tester, Lxuemlu Professional 3-in-1 TDS, Temperature and EC Meter with Carrying Case, 0-9999ppm, Ideal ppm Meter for Drinking Water, Aquariums and More https://www.amazon.com/dp/B079DN9DRS/ref=cm_sw_r_cp_api_i_T778FF50VFAZ0TBFAKJ6?_encoding=UTF8&psc=1
https://www.amazon.com/gp/product/B073713G5F/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
I used this device. I actually thought ppm was like a general unit for particles in general in water lol. But yeah I'm not so sure this device specifies what it is exactly
If you’re questioning it, you should test it yourself. Water Quality Tester, Accurate and Reliable, HoneForest TDS Meter, EC Meter & Temperature Meter 3 in 1, 0-9990ppm, Ideal Water Test Meter for Drinking Water, Aquariums, etc. https://www.amazon.com/dp/B073713G5F/ref=cm_sw_r_cp_api_i_BX53MBYCAFJ814V749ZG
TDS Meter Digital Water Tester, Lxuemlu Professional 3-in-1 TDS, Temperature and EC Meter with Carrying Case, 0-9999ppm, Ideal ppm Meter for Drinking Water, Aquariums and More https://www.amazon.com/dp/B079DN9DRS/ref=cm_sw_r_apan_i_7NF66GZ1TRC8TCAEM58K
Used this the past couple years. Havnt had any problems. Don't cheap on ph. Ppm doesn't need to be as precise.
No issues so far and it does everything you need it to. Comes in a nice box with a good amount of calibration fluid. The tips are replaceable. The say it's water proof but I haven't dropped it in the water yet.