PH Meter, Digital 4 in 1 PH EC TDS Temp Meter for Water Hydroponics, Waterproof DWC PH and EC PPM Water Tester with Backlit for Nutrients Growing, Indoor Garden, Home Brewing, Pool, Aquarium

If you want $500 meter accuracy, go buy a $500 meter. If you want $150 meter accuracy, this one will get you close enough to where it doesn't matter.I've been using this twice daily to check the levels in four 10 liter hydroponic buckets growing Carolina Reapers, and I've been cross-checking and verifying the readings with a BluelabpH pen and Truncheon with 3 part/value calibration fluids twice a week.So far, the EC and TDS values have been within +/-150 points of the cal fluid and Bluelab meters and the pH reads a very consistent +0.11, the temperature is within +/- 2 degrees fahrenheit as judged by a $400 Fluke thermocouple thermometer.As long as you're willing to calibrate this meter properly and check around monthly that it hasn't drifted off, it gives startlingly accurate and CONSISTENT (arguably more important than accuracy if you use good calibration fluid and record how far off the readings are) results. The biggest annoyance I can possibly find is that you need to have still water, no bubbles or large flow and you need to let it sit in the water for 30-40 seconds to get a truly stable reading, but once it's stable it's accurate!It's amazing that cheapo meters like this can give consistent readings that 5-10 years ago were relegated to the $600+ commercial equipment realm.

This is a good accurate pen. Just recalibrate it occasionally and it will serve you well. This one was actually calibrated to 7.00 right out of the box, unlike several other brands that have promised that before. I check this one with other pens to verify accuracy and it's right on usually all the time.

Manufacture replied and sent a replacement meter that is working fine. My mistake was not purchasing two meters so when one failed I had a second to continue measuring nutrients for my hydroponics. Meters sometimes will fail and I should have had a replacement handy since I needed it everyday. I may have gotten a marginal meter the first time. The manufacture did stand by their product and sent a replacement quickly. The original meter worked fine for 2 months, but then stopped calibrating Was told by Amazon no replacement after 30 days how nice! I give the meter 4 stars since they sent a replacement, but should have worked longer the first time. For the price you can't really expect a high quality instrument.

This pen is very easy to setup. Comes with batteries ready to go. Comes with packets to balance the pen. You will need some distilled water to help calibrate. I recommend it. So far so good few years in.

I have seen it so many times with new people in plant hobbies that just have to spend a fortune to try and buy a good grow. I understand that high quality equipment is very important with horticulture but you can accomplish the same goal without spending a fortune on the best name brands. I've had two of these in the past 3 years and that has been twice as long as my Blue Lab and Apera meters have lasted and they were over 6 times the price of this cheap chinese meter so take that as you will

Probe is reading pH's of buffer solutions almost 1.01 whole point lower than each pH packaging implies should be (4.00 solution offers 3.01 reading, 7.00 solution offers 6.01 reading, and the 10.10 offers 9.11 reading). pH of buffer solution was tested w/ pH strips to ensure the solution values were accurate prior to attempting calibration, and of course mixed the powders with 250ml of distilled water as directed. The whole point of calibration is being able to adjust output readings based on input values so that output is setting out the correct measurements.This pH probe is useless as is unless I want to add .99 to each and every measurement I take, though I have no confidence in the product anymore anyway.Also, the cap contained a sponge that instructions indicated was supposed to be moist. It wasn't, and there was some kind of unknown clear slime on the inside of the cap that I'm sure the probe had contact with or that somehow leaked from the probe.Either way, I'm not happy. Product packaging instructions indicated it could be returned or replaced within 12 months, but Amazon's stated option is only 30 days. We're about 15 days past that, so I guess I'm just ripped off.Sometimes it reads straight 0000 across unless you kind of knock it against the glass, insinuating that there is a faulty connection or chip in there somewhere (despite unscrewing and ensuring everything is connected properly).*Editing to add*This product did not come with the calibration solution for EC/TDS settings either, nor the storage solution (I read in a review that product finally calibrated correctly after being submerged in SSolution for 24 hours, and given the cap sponge was so dry, thought I would try BUT I don't even have that option here. Did add a couple of drops of distilled water to cap sponge as per instructions, but it does not seem to matter much)And, only 2 packets each of 4-7-10.01 pH buffer solutions, which is also unhelpful beyond 2 calibrations, IF they had worked in the first place.

Seems to work well. During storage the bulb on the end needs to stay moist. I had mildew problems with mine. Otherwise it's ok. Nice it came with a few calibration packets to verify it's operation.