The AC Infinity Leaf VPD & Temp Monitor is a handheld infrared thermometer that measures leaf temperature directly, then combines it with ambient temperature and humidity to give you true leaf VPD as well as air VPD. It is the instrument that closes the gap between what your controller calculates and what your plants are actually experiencing — and the fastest way to set a leaf offset that is based on measurement rather than a rule of thumb.
Measure the leaf, don't guess the offset
Every VPD figure your controller shows rests on an assumption about how much cooler the leaf is than the air. The common shortcut is to assume two or three degrees and move on — but that number changes with your light intensity, your airflow and how hard the plant is transpiring, so the assumption is often wrong in the direction that matters. Point this at the canopy and you get the actual leaf temperature, which means the actual leaf VPD.
Then put the measured offset into your controller or Cloudcom and every automated decision from that point on is working from a real number. That is the whole job of this tool, and it is why it is worth owning even if you already have good climate control.
A reading you can trust to hit the right spot
The 12-point laser ring shows you exactly what area the sensor is reading, so you know you are measuring a leaf and not the pot behind it. The 12:1 distance-to-spot ratio means that from 60 cm away you are reading a 5 cm circle, which is about a leaf. Emissivity is adjustable from 0.10 to 1.00 — leave it at the leaf setting for canopy work, adjust it if you are measuring something reflective.
It stores previous readings, so you can walk a room, take a dozen measurements and compare them without writing anything down. Response is under half a second, which makes a canopy survey quick rather than tedious.
Specifications
| Product identification | |
| Manufacturer | AC Infinity Inc. |
| Product name | VPD Thermometer |
| Model | AC-TRV3 |
| UPC | 819137024496 |
| Dimensions | |
| Total dimensions | 15.1 × 10.3 × 4.5 cm (5.94 × 4.05 × 1.77 in) |
| Performance and technical | |
| Readings | Air VPD, leaf VPD, air temperature, leaf temperature, relative humidity |
| Measurement | Infrared, 12-point laser positioning |
| Distance to spot ratio | 12:1 |
| Temperature range | −50 to 550 °C (−58 to 1022 °F) |
| Emissivity | Adjustable, 0.10–1.00 |
| Response time | Under 500 ms |
| Stored readings | Yes, historical recall on the device |
| Documentation | |
| Product manual | |
FAQ
Do I need this if my controller already shows VPD?
Your controller shows VPD calculated from air temperature, humidity and an offset you typed in. This measures the leaf, so it tells you whether that offset is right. If you have never verified it, there is a reasonable chance your controller is holding a VPD target that is a fair way off the one your plants are in.
Does it connect to the app?
No — it is a standalone handheld instrument with its own display and on-device history. It is not part of the UIS platform and does not log to the AC Infinity app; you read it, and you use what it tells you to set your controller.
How far away should I hold it?
Close enough that the spot lands on a single leaf. At 12:1, 30 cm gives you a 2.5 cm circle and 60 cm gives you 5 cm. The laser ring shows the area, so aim with that rather than estimating.
Will it work on things that aren't plants?
Yes — it is a genuine IR thermometer with adjustable emissivity and a range up to 550 °C, so duct surfaces, driver housings, water and equipment all read fine. Set emissivity to suit the surface; shiny metal reads low if you leave it on the leaf setting.
Can I leave it in the tent?
It is not designed for that — it is a handheld meter you carry in and out. For a permanent reading point you want a Cloudcom B1 or a controller probe; this is the instrument you use to make sure those are telling you the truth.
