Reyke 2-Pack Soil Moisture Sensor Soil Humidity Tester - Accessory Only, Can Not Be Used Alone

While I have not checked this product for complete accuracy, I find this product very useful. I am monitoring 6 separate garden areas and they should be accurate enough to let me know when I need to water them. As I have read in articles, well watered soil only measures 70% +/- moisture due to the air space in the soil. I have one that is reading 77%, which is the highest reading I have gotten. My lowest reading after receiving the same amount of rain is 49%, because this is in a looser and very well drained soil. We have had a lot of rain and I am watching them while physically feeling the soil to see how they correspond to their moisture reading when they bottom out. This will then tell me when I need to water the individual gardens. These are easy to set up and have a long transmission range. My monitor is inside my house and is reading all the probes with the farthest one being about 56-feet away.

Works well enough. Sometimes you have to remove it from the soil to reset it to get an accurate reading. Make sure you use good batteries like Duracell.

This system is nicely designed with a solid look and feel and ease of use. Complete with all the batteries, markers for your plants, even a couple wall anchors and screws to mount the panel. I enjoyed setting up the 4 sensors, marking and pairing them with the Display Panel, all went very smoothly with the included instructions. And it functions well, the readings are immediate and consistent. The sensors are very sensitive and VERY specific as they take their moisure readings at the tip of the sensor only. I had to practice a bit with the sensor placement to learn how to work with them and understand what they're telling me and can now target very specific zone and depth with these.

These look very good and very convenient to have a remote reader.HOWEVER! 2 out of 4 sensors don’t seem to read correctly.I have 2 kinds of planters 4 total labeled 1 and 2, 3 and 4. I water them equally.For 1 and 2, 1 shows 47% 2 shows 21% and I give them time to equilibrate but still so different. It was working yesterday with pair 1 and 2.For 3 and 4, 3 reads zero even though I water throughly like 4 and 4 reads 30%.I understand I have to set up correctly and I believe I did and different part of the soil might have different results but shouldn’t be this different.

Being an inquisitive person (I work in research and development for a Fortune-50 company), I immediately noticed some issues with sensor accuracy. With a known good precision thermometer as a comparison, all 6 sensors read between 7 and 12°f high. I don't care, that's not what I need. The light level data seems fairly accurate. I don't care. What I DO care about is soil moisture and I noticed issues as soon as I started placing them in my garden. All 6 paired with no issues, but the moisture levels seemed WAY off. I filled a small pot with soil, and fully saturated it over about 30 minutes. I tested each sensor individually. The 6 sensors gave the following: 8%, 14%, 22%, 36%, 48% and 62%. The test was repeated with little variation in data, but the same soaked pot of soil. I'd say 3 of these sensors are close to worthless, and 3 of them are somewhat-ish accurate enough for me to be able to use. I figure if I had 6 more sensors, I might be able to assemble a good set of 6 between them. Apparently sales were put before quality on this set.

Good wireless range, readings seem appropriate. I'm setting up a new raised bed garden boxes up on legs (June Zone 9). I bought 4 small boxes (~1.7 cu ft each) that I filled with commercial raised bed "soil" where I intended to plant flowers and herbs. I then decided to level my garden area, and stuffed transplants into these boxes. I designed and leveled my garden area, but by then it was July and we got a 105-113°F heat. I have 4 larger boxes (8 cu ft each) filled with diy "soil" designed for water retention. I water the big boxes every few days when moisture drops below 60% and soil feels damp/drying by feel. However, the small box with two tomato plants needs water every 2-3 hours. I appreciate these moisture meters. I'd have killed my tomatoes without them. I wish I could use 12 probes rather than 6. Light intensity and temperature readings convinced me to set up shade cloth quickly.These are very easy to set up and use. I bought a second set I will save as a backup, and I bought an accessory pair of probes to add to the original 4 probes. Good value for cost. I tried more expensive sets that failed quickly. I'm also using stand-alone direct reading soil pH and nutrition meters.

Other reviews of this product had me concerned about the soil moisture measurements. From an accuracy standpoint, I've found that the placement and especially the depth of the sensor produces very different results. Even the density of the soil itself has a significant effect. As a result, I pretty much treat the measurements as relative values rather than absolute.There is some good news for those of you who are into home automation. If you search for rtl_433, you will find a software package which, coupled with inexpensive hardware, will receive the signals from the sensors and provide the same data to a home automation system (such as Home Assistant) that you see on the standalone display. This would allow you to trigger events such as soil moisture below a certain value or a low battery condition in a sensor.

These work good in my vegetable garden they get overhead watering every day in the rain and 100° heat in the desert as long as you’re within distance of the inside display I have no complaints. They seem accurate.