VBR-100 Quantum PAR Meter 6000umol/(㎡s), RGB PAR Breakdown, PPFD Distribution Mapping, Bluetooth Free App, Sensor Name(VBR-100 Plus), No Spectrum Selection

Works like a champion. My quantum meter of seven years has finally gone to that electrical place in the sky i purchased it as an open box Item on Amazon for 80 bucks now I need a new one, and I will never spend $500 for an apogee after I've had a cheap one that was the same as the apogee. Shane from my grow made a video of it. I recorded my like distance and par readings before the meter died, so I know the distance. Because my light is just as old as the meter was. I gave this one a shot, and sure enough at that distance that my old meter was this was pulling off almost identical numbers. I knew from that point that it was accurate. The functions are easy, very user friendly and the spectrum value is a plus if they're accurate. I have no way of knowing, but for the price. This is awesome. Now the durability might be a little different. It feels a little lightweight, cheapy, but hey, take care of your things. Its what inside that makes me like it. The accuracy,and For the 50 bucks, I paid, I'll give this 5 stars

Works great very simple to use. As far as I know, it’s reading what it’s supposed to. I have nothing to double check it with, but I know where it’s at so when I change the light setting, I know exactly how much I’m going up or down on intensity. easy to hook up to your cell phone very convenient I would recommend

Here's the deal - I found this very useful both indoors and out. It helped me map my greenhouse lighting and the yard for intensity, and was superior to 'phone apps' in this regard. There is a caveat - sunlight intensity is bang-on, within 5% vs weather station predictions. However, indoors under full spectrum grow lights with deep red, or UV, or higher frequency blue tones - this would UNDER estimate PAR by 20-40%. I believe this is due to several factors: even high quality LED light is less even spectrum than sunlight, and whatever equation is used by the sensor doesn't account for uneven sensitivity to spikey spectrums; I don't believe this meter accurately measures above 650nm or below 450nm - no ePAR here; the geometry of the lights, while apparently cosine corrected under some fixed function by the meter, the diffusion panel is not perfect, and can over or under estimate when point sources are used, even if they are distant. This reduces linearity. If you really want accurate measurements under LED, I recommend taking several heights as well, and generating your own inverse square function to characterize your light cone. The cost is hard to beat, and the results are highly reproducible (precise) even if some adjustment is required for accuracy per situation. I would take several close readings in a small area (10" circle) and average them for a truer report. The property angle for best accuracy is directly vertical. If the lights are LED, especially broad spectrum, watch your plants for signals that PAR is higher than estimated - depending on your spectrum, they may be getting half again the photons this suggests. Still, I found this a useful tool, and will continue to use. Phone connection is dead simple and stable. Mapping feature is useful. Outdoors it is directly reliable. I would recommend to the vendor that they include selection of light source modes and provide more accurate models based on the type of lighting being measured, rather than calibrate to solar spectrum only, as this appears to do.

Quite easy to use, settles on a reading quickly, and gives consistent readings with little noise. For the price, this is great. I don't have another PAR meter to compare it to, but based on readings I've taken from other lights that I have quantified, this seems to be pretty close to the $500 meter I rented a while back. One feature that I wish that they'd incorporated would be the ability to use it as a true daylight exposure meter, where you leave it in one place throughout the light cycle and it provides the DLI for that exposure time. Right now the app does have a DLI calculator, which certainly is nice for situations where light is constant, but that is based on the instantaneous reading and the number of hours you enter into the calculator. If this functionality was added to the app, this would be a really exceptional piece of kit.

Works with my phone so it keeps the cost of the unit to 50$. Works just as well or better tbh than all in one units I have used that cost 400$ plus, has a dli calculator and spectrum brake down and no need to buy an app. If you need a par unit and want to use your phone as a controller its a good buy. The app to run it is free and on apple/android

Says my Bluetooth isn’t on but it is waste of money more Chinese crap

This small little device works perfectly for what it’s intended to do. I grow inside of a tent indoors and it measures the light exactly the way that I would needed to it only uses one battery and it seems to last for a while and it’s a very good price compared to other sensors .

Great instrument, reads ePAR at 99.6% of calculated solar ePAR IN ePAR MODE.

Funktioniert einwandfrei, gibt nix zu beanstanden.

Helps alot.

Entrega muy rápida. Cumple su función perfectamente igual que otro mucho más caro. Medición muy fiable. Muy contento

Es muy buen aparato, práctico y útil para medir la cantidad de luz que llega a las plantas.

Exactly as described, very happy with product. Have already used multiple times and very happy with the results its provided.