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When AH-20 doesn't work, please change the battery and it will work at once.
To judge if a plant got enough light, need to integrate a whole day's PAR.
Different plants, different stages of growth, require different DLI.
AP
2025-08-02 12:04:03
It's well made with bright large numerals. The trick is understanding how to use it. This is what I do: I set it in the outside location the night before. At midnight, the data in memory location zero is moved to location 1 and location zero is scrubbed. Data starts to accumulate in location zero and you may view it at any time by pressing the button. Once again, at midnight, the total amount of photons in location zero gets moved to location 1, 1 gets moved to 2, and so on. Location zero is now ready to get new data again. It's very ingenious and works well. I do recommend it.
Geri
2025-07-19 13:23:50
Couldn’t figure out how to use it
Derek
2025-07-05 10:34:52
I have had this for over a year. I have tested it with other DLI meters(one costing $1,000) and the consensus is that this aquahorti dli meter isn’t even close to accurate. Instructions and customer support are absolute garbage. Buyer stear clear
Connor
2025-06-24 17:37:58
This is a handy tool to track how much sun my yard receives during a day. This will take the guess work out of planting locations. Easy to use (not sure which said it was difficult?) and worked right out of the box. Highly recommend.
LW
2025-06-17 15:33:39
Simple and worked great for 2 weeks then stopped working altogether
Buyer
2025-05-10 17:43:59
It gives u an idea how much sun light a given spot is getting. It keeps history for past days. I just wish I know how to turn it off when I don't need it anymore. Just seems to continue to measure light even when I put it away.
Jane H.
2025-05-06 17:58:27
I started by using this sunlight calculator to measure my indoor grow lights. It didn’t work. I tried under two different lights over the course of a week. The numbers were in the decimals and lower than an hour, not making sense at all.So I took it outside to the brightest spot on my patio. I got 9 hours of actual sunlight (give or take), which made more sense. I left it there for a few days, then moved it to a shadier spot. 5-6 hours of sunlight since it had also been cloudier. So it does work outside, but not under grow lights. Also, this sunlight meter is low tech and I couldn’t figure out how to reset it back to Day 1. If you plan on moving it more often than every 10 days you will need to keep track somehow of what day you are on (mentally or on paper).There has been a learning curve, but over time I have discovered that the sun/shade moves about an inch per hour of sunlight on my patio. The total amount of light changes, of course, as the days get longer/shorter depending on what side of the calendar we are on. For this spring/summer I have been better able to arrange my plants to prevent sunburn of some and allow others to thrive more. I have also been able to better determine how much sun the plants on the lower shelves are actually getting (picture shows that on Day 6 the shelf got 1.4 hours of sun total). During fall I will use to place items into my greenhouse based on their light needs and how much light each section actually gets..I like that the stick part of the device is long enough to keep it upright in soil. It is also a sturdy plastic so no rust to worry about.Update: I figured out this device and found it helpful….but it stopped working after just a few months. It did not get wet at any point since it’s on a patio. I did not drop it. It just won’t turn on now. And there is no way to replace the battery. Disappointing.
Patricia
2025-04-29 13:57:12
Helped me figure out where on a partly sunny deck I actually get the most hours of sun. My roses are so much happier!!
Customer
2025-04-23 10:56:50
parfait
Nicky
2025-01-19 10:35:51
I returned the ones with the app, this one has worked much better.I wish the app one worked better but oh well I'll just have to keep a log the old fashion way to figure out the spots in my garden that are full sun or partial sun etc.Have been using it for a month now, lots of rain, no issues.
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