Bonsai Lab Guard Laser Particle Meter, PM1.0, PM2.5 and PM10

4.80 stars, based on 5 reviews 5 review(s). | Write a review

See whether your flow hood's air is really clean.

Laser sensor detects particles down to 0.3 micron
Live PM1.0, PM2.5 and PM10 on one screen
Also shows temperature and humidity
Six color-coded air quality levels
USB-C powered (no internal battery)

Retail: $79.99

Price: $59.99

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Description
Reviews (5)

You can't see whether a flow hood is doing its job. The Bonsai Lab Guard gives you a number instead of a guess: a laser particle sensor that counts particles down to 0.3 micron and shows PM1.0, PM2.5 and PM10 live, along with temperature and humidity. Hold it in the air coming off your filter and you'll know in seconds whether that air is clean.

0.3 micronSmallest particle
PM1.0 / 2.5 / 10Read together
Temp + RHAlso displayed
6 levelsColor-coded
USB-CPowered

What it does in a mushroom lab

Verify your hood or FFU

Compare room air with the airstream at the filter face. A working HEPA filter reads dramatically lower than the room.

Track filter health

Log a reading at the same spot every few weeks. Numbers that creep up tell you to check the filter, gasket and seals.

Time your work

See when a room has settled after sweeping, mixing substrate or running a fan, and check a still air box before you open bags or pour plates.

Checking your flow hood

1Power it

Plug it into USB-C power and give it a minute to stabilize.

2Read the room

Take a baseline reading away from the hood and note the PM numbers.

3Read the airflow

Run the hood a few minutes, then hold the meter in the airstream near the filter face.

4Compare

Clean air should read far below the room. If the numbers are close, inspect the filter and its seal.

Plan for power. The Lab Guard has no internal battery. It runs whenever it's connected to a USB-C port or power brick, so keep one at the bench.

Lab Guard specs

Measurement	Range	Accuracy
PM2.5	0 to 2,048 ug/m3	+/-10% at 100 to 500 ug/m3
PM10	0 to 2,048 ug/m3	+/-10% at 100 to 500 ug/m3
PM1.0	0 to 2,048 ug/m3	+/-10% at 100 to 500 ug/m3
Temperature	32 to 140 F (0 to 60 C)	+/-1.8 F (+/-1 C)
Humidity	20 to 90% RH	+/-3% RH
Smallest particle	0.3 micron	-
Sensor	Laser light scattering, Mie theory algorithm	-
Power	USB-C, no internal battery	-

Pair it withTest any flow hood or fan filter unit, and keep a replacement HEPA filter ready for when the numbers say it's time.

Common questions

Will it tell me if my flow hood still works?

Yes, by comparison. Read the room, then read the airstream at the filter face. A healthy HEPA filter reads far lower than the room. If the two are close, check the filter, gasket and seal.

Does it detect mold spores or bacteria specifically?

No. It counts and sizes particles but can't tell what they are. Dust, smoke, skin cells and spores all register. That's what you need to check filtration, but it isn't a contamination test.

Does it have a battery?

No. It runs from USB-C power, so it needs to stay plugged into a port or power brick while in use.

How small a particle can it see?

Down to 0.3 micron, the particle size HEPA filters are rated against.

Can I use it in my grow room?

Yes. Along with particulate it shows temperature and humidity, which helps in incubation and fruiting spaces too.

Overall Customer Rating of 5 Reviews:

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Blake

this product is a lot better than I anticipated it would be

12/19/2024

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Cons:

When I first thought about buying this, I figured it would be very flawed, especially since most similar particulate meters are hundreds to thousands of dollars in cost. But it had been recommended by someone who's opinion I valued. Then when I received and first tested the meter, it read 0 throughout my growing area, which I knew was improbable (or impossible), so I shelved it. several days later I used it in a very debris ridden garage and the readings reflected it. So I took the meter back home and retested my growing area and now the readings were realistic: 0 in front of my laminar flow hood, but gradually increasing in particulate as I moved away from the hood. If I had the hundreds to thousands it would cost for a MET ONE laser, I would buy it. But for an inexpensive alternative, this one seems fine.

Scott

I like this thing

6/20/2024

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I think it works well I've been analyzing the effectiveness of my flowhood with and without the house ac running. I have side panels for my 2x4 and I was able to confirm that the flowhood's sterile feild was extended some. The feild was pretty small on my Lrfh

Better than others

1/6/2024

Rating:

Pros:

High quality and durable.

Cons:

None I have come across

I really like this tool. The display is big enough to easily read and it was calibrated when I received it. Thinking about buying a couple more.

Caleb_dre

Works!

11/14/2023

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Pros:

Cons:

Came with easy to follow instructions and a link to a video tutorial, very straightforward and easy assembly. Arrived very quickly too!

Adam22s

Very Useful Tool

11/12/2023

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Pros:

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I was looking for something that would read super low micron that was under $100 and this is perfect! I just received and my room without my flowhood is Dirty As Fu*k. I will report back after I run it for a few hours. Great little device