General Tools has grown to become the recognized industry leader for specialty hand tools and instruments. The UV513AB is designed to measure ultraviolet light in the range from 280 to 400 nanometers (UV AB). The illumination range of the meter allows users to conduct the most precise quantitative measurements of ultraviolet radiation for radiometry and laboratory requirements, UV-curing in off-set printing, lamp UV intensity & aging, industrial process monitoring, semiconductor fabrication, sterilization and environmental monitoring.
Spectral range: 280 to 400 mm
Measurement ranges: Low (1 µW/sq.cm to 9999 µW/sq.cm) and High (0.01 mW/sq.cm to 40.00 mW/sq.cm)
Auto Focus,Backlit,Cosine Angular Correction,Data Hold,Data Log/Record
Maximum Accurate Measurement (fc)
Minimum Accurate Measurement (fc)
Number of Batteries Required
Product Weight (lb.)
Sampling Rate (samples/sec)
Test Meter Type
Tools Product Type
Warranty / Certifications
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out of 11 reviews
100%recommend this product
Showing 1-10 of 11 reviews
Oct 31, 2018
A compact sensor/readout combination, this meter will be of use in many non-critical applications. The two parts of the device are hardwired together, and a “wand” is supplied in which to mount the sensor head to allow positioning of the sensor. The readout unit is provided with a standard tripod mount as well as a magnetic mount and lanyard (though the tripod mount would probably be of more use on the sensor wand to permit use at a fixed position and angle). The sensor head needs to be installed into the wand and the five screws (supplied) installed (after carefully routing the cable to avoid pinching) to secure the wand halves. Four (4) front panel buttons permit powering up/down the unit as well as selecting the sensing range, Max/Min/Avg measuring function, measurement “hold” as well as recording and retrieving up to 20 measurement points (memories). There is no provision for downloading the data for further processing/analysis. A calibration certificate is included (valid for two years) traceable to a Republic of China (Taiwan) National Measurement Laboratory Standard. The LCD display is backlit for ease in viewing in poor lighting conditions though, while the primary and secondary numerical displays are easily read, some of the other screen information (units, measurement mode etc.) are rather small and may present difficulty for those wearing corrective lenses. When choosing the “Auto Record” mode, one can select from nine (9) time intervals (1,2,5,10 and 30 seconds/ 1,3,5,10 minutes). When the twenty (20) measurement points are recorded, the unit will power down. The device is powered by a 9-volt battery (supplied) which is installed into the rear compartment, which has a captive cover, not requiring tools to access. The padded case will afford protection to the meter/sensor when not in use or in transit. The two measurement ranges (1 to 9999 µW/cm2 and 0.01 to 40.00 mW/ cm2) is adequate to make measurements ranging from direct sunlight to output of a compact fluorescent lamp (CFL). If you need to make relative measurements of UV and do not need an NBS traceable calibration, this meter will be adequate for many uses.
The general Tools UV AB meter was shipped in a larger box to protect the retail case from being d...
The general Tools UV AB meter was shipped in a larger box to protect the retail case from being damaged.
The meter set comes in its own padded protective carry case, which is vary nice since that saves me from having to purchase a generic gun case from home depot to put the meter in.
This product should be 280 - 410 nm for full uvab.
On the box it says 280 - 400 nm like the older unit General Tools made how ever in the instructions it says 290 - 370nm.
When contacted the manufacturer did not respond to the question of why on the box, case and advertising it says "280 - 400 nm " but in the instructions it says " 290 - 370 nm "
The uvab meter can be used to measure a verity of uv sources.
I would have to guess they general tools has it calibrated to read sun light as it is the most common uv light source.
Which brings me to its first use,
 solar panels- it can be used to measure the suns output for setting up solar panels,etc.
 sun tanning / exposure - or even just going to the beach or a park.
 window tint - and to see how much uv is getting through window tint into the car, house, boat, etc.
 commercial / industrial applications - It can be used to measure industrial curing bulbs that are used in a wide verity of commercial and industrial applications.
From curing resins, fiberglass coatings, ink, and testing exposure to the sun on building products in a controlled environment.
 tanning / nail salon it can be used to measure the output on tanning bulbs in a tanning bed or even the curing lights for nail polish.
 photo therapy / medical bulbs - it can be used by Doctors offices that use uv bulbs for a verity of photo therapy purposes.
 reptile bulbs - it can be used to measure the output of full spectrum uva uvb bulbs used for reptiles that simulate the subs light for calcium production into vitamin D to prevent disease in captive reptiles.
 plant growth bulbs - it can be used to measure uv bulbs used to maximize plant growth in nursery/ garden centers etc.
 green house - it can be used to measure the penetration of the sun into green houses.
 laboratory/testing purposes - it can be used for testing different things in a laboratory from any thing as testing products to the effects on uv light on bacteria.
That should cover most practical applications although I am sure their are some I did not think of.
In order the properly use the meter for any thing other then measuring natural sunlight, you need the base line readings from the manufacturer of what ever kind of bulbs your using.
you can also make your own base line readings if those are not readily available.
The sensor on the meter is vary sensitive, so in all regards that must be taken into consideration.
If your going to make your own base line readings.
1] the bulbs should be tested when new and record the readings.
2] after the 30 day break in period for new bulbs they should be retested and record the readings.
3] then take readings periodically and record them to track the bulbs degradation.
if your bulbs have base line readings but the meter measures new bulbs differently, since the meter is calibrated to sun light, not all bulbs will give expected readings.
you can make a rosetta stone translator by recording the new bulb expected base line reading and next to it the meters reading.
and track those readings over time using the formula of :
example : expected reading 100 uw/cm2 uvab at 4 inchs from bulb new
meter processed 425 uw/cm2 uvab at 4 inchs from bulb new
30 day reading expected 80 uw/cm2 uvab
meter 405 uw/cm2 uvab
Their may be times when a log will not work as expected due to different wave lengths of bulbs output[ narrow band vs. wide band, etc ], so then you can make what you see in my picture being a optical attenuator, a optical attenuator allows a controlled amount of light to go to the sensor and by doing this the meter can be calibrated to different light sources so it will give the correct readings.
In my case The output from full spectrum reptile uv bulbs[ UVB to visible light ].
I did make it my self and it is made from a patented reflective material 'techbrite miro4' which is used for t5 bulb industrial light fixture reflectors.
The size of the hole you need to properly measure reptile bulbs is 7/32
But that is jumping ahead a bit,
I have many different kinds of meters for measuring UV light.
One is a solarmeter 6.2 reptile bulb calibrated UVB radiometer so it is the base line.
I also have a calibrated sri-2000uv Spectrometer that reads from 250 - 850 nm.
SO first you need to set up a lamp on a test bench and a tape measure so you have a distance measurement.
Then at the set distance the meters need to be in agreement of the output of the bulb.
I have a uvx uvp 31 uvb sensor that is a $1200 meter set, it comes with a optical attenuator that the user must set the aperture size for.
Once the aperture is set it will give the same readings as the solarmeter 6.2 and the sri 2000 spectrometer.
As such it was as simple as setting the measurement markers in the sri2000uv for the correct spectral response [ 280- 410 nm ] as this is a uv ab meter [ uv513ab ] then looking at the total power output [ Ee - Total equivalent energy ] then making a optical attenuator that would allow the correct amount of light in to the sensor of the [ UV513AB ] to measure reptile bulbs.
Of course I can cross check readings against the international light 1700 & 2400 research radiometer's and ocean optics usb2000uv spectrometer as well.
Ok, so it wasn't simple, how ever it is the meters operator that in the end is solely responsible to make sure the meter is being used properly for the application to insure accurate readings.
It should be noted that their are differences in the response curve between different kinds of sensors as well as their response range.
as they are manufactured differently from different materials and many have different designs from one another.
[ solid state, vacuum photo diode, silicone photo diode, photocell ] just to name a few.
I have seen in a review where some one is using this meter to measure UVC [ typically 240 - 260 nm ], how ever that is a incorrect application.
As this meter can only measure 290 - 370 nm [ UVAB ]
When you use this measure a uvc bulb what your measuring is the residual UVAB being put out in the process of making UVC.
The only way that can work is you would have to have the uvab readings written down that when reached mean the bulb is no longer capable of putting out the correct amount of UVC.
The connection from the meter to the probe of this set is hard wired.
They do have a set pictured that is not hard wired and has a plug in.
that is also a good design how ever over time the connection point can wear out then the meter set does not work as good and can give false readings due to the failing connection.
The meter it self has magnetic mounting and screw socket for tripod mounting.
A nice easy to read back lit lcd screen
measures in either mw/cm2 and uw/cm2 depending on the user setting.
[ more on that later ]
A memory that has 20 point data log.
a hold button
min/max/ averaging functions
auto recording reading over time
a zero adjust
low battery indicator and comes with a 9 volt battery and a 1 year warranty.
their is a wand that the probe can be mounted in [ included ]
It comes with instructions in English that describe what all of the functions are and how to use them.
Its retail box is a hard plastic protective case with padding inside of it to keep the meter set from being damaged when not in use.
Some people have asked exactly what does mw/cm2 and uw/cm2 mean.
To answer that first you have to know this.
When measuring the uv radiation put out by the sun, you have a couple factors.
First is the intensity which is the same as volume, amount, level or saturation of the ultraviolet light your going to measure.
Second is the area it covers.
The larger of the 2 measurements this meter takes is
mw/cm2 - Irradiance (Intensity) • Expressed in milliwatts per square centimeter.
mW/cm2 - mw - milliwatts / cm2 - a square centimeter
the smaller measurement this meter takes is
uw/cm2 -Irradiance (Intensity) • Expressed in Micro-Watts per square centimeter.
uw/cm2 - uw - Micro-Watts / cm2 - a square centimeter
The difference between these 2 readings is 1 mw/cm2 = 1000 uw/cm2
SO this meter set is capable of measuring vary small amounts of uv radiation levels in a vary small area.
Which is why the sensor is so sensitive for this meter set.
The displayed reading of this meter is the - Ee - total equivalent energy - reading the output of the source in UVAB [ 290 - 370 nm ]
IT should be 280 - 410 nm for full uvab.
On the box it says 280 - 400 nm like the older unit they made how ever in the instructions it says 290 - 370nm.
If you do not know the base lines then all of your readings are relative and you should record the readings when the bulbs are new, broken in and at the end of life span and keep those measurements as your baseline readings.
I hope in reading this that you find this explanation helpful into under standing this meters uses, how it should and should not be used, how it operates and its basic function including how to read the readings that are shown on the screen.
I have done my best to water down the science as to make it understandable to normal people that did not go to collage to learn how to use this kind of equipment.
8 people found this helpful
Sep 21, 2018
The Digital UVA/UVB Light Level Meter is a good meter if you looking to test out the availability...
The Digital UVA/UVB Light Level Meter is a good meter if you looking to test out the availability of UVA/B light. It can be used for a variety of light measurement.
Assembly and the instructions are a bit curious as the instructions where very obviously translated and are a little confusing. For such a nice product you have to assemble the meter which is a bit odd, not difficult but a bit of a pain to thread the wire in the handle then use the enclosed screws. The case also does not have the molded channel from the meter to the monitor section, nothing an exacto cant fix. At this price point would have been easy to fix these issues.
I used it on some of my led lights that I was thinking of using to start seedlings with and check some sun coming though "filtered" windows. Glad I had the meter as it showed quickly the led are not strong enough for what I want to use them for.
Overall good meter, has a tripod mount, case, and a magnet to use on metal, but lacking a few minor details.
Very nice UV meter for both UVA and UVB. What You Get In The Box: 1 - Meter with Attached Sensor...
Very nice UV meter for both UVA and UVB.
What You Get In The Box:
1 - Meter with Attached Sensor
1 - Sensor Wand (Sensor Housing)
1- 9 Volt Alkaline Battery
1 - Instruction Manual
1 - Blow Mold Case
This is a very easy to use meter for measuring UVA and UVB light. This is a great tool to measure the UV light from grow lights, UV water purification bulb life cycle and how well windows are blocking UV light.
This meter can measure both spot and timed UV light radiation. This can be very useful for testing things like how the windows in your home are blocking UV light. As a test, I tested my windows; this meters shows that the windows are blocking 85% of the UV radiation from the summer sun. This meter is also useful in testing how much UV radiation is passing thru something like your sunglasses or even your cars windows.
The meter is well built and feels very solid in your hand. The back of the meter has a standard tripod mount and a magnetic mount to quickly attach to any ferrous metal surfaces. The battery compartment has a swing open door that's very easy to open. The back of the doors surface has a sticky silicone pad so your fingers can get a very good grip on the door and slide it open.
This is an excellent tool for measuring and verifying ultraviolet intensity on UV lamps in HVAC u...
This is an excellent tool for measuring and verifying ultraviolet intensity on UV lamps in HVAC units. As a facility manger in a building with large air handling units that have UV lamps for germicidal and mold protection, this instrument allows me to verify that the UV bulbs are still emitting adequate light to perform. Before I got this instrument, I would change the lamps once a year to ensure they were working but now I can measure the light intensity and change the bulbs as-needed which saves money because the UV bulbs are not cheap. The instrument comes in its own mold formed case and is easy to carry transport without breaking. The base of the unit has a magnet on the back that attaches to the air handler and allows me to hold the wand inside the area to be tested. Comes with its own 9-volt battery. Easy to use.
This instrument has exceeded my expectations for a meter at this price. It is well made and easy ...
This instrument has exceeded my expectations for a meter at this price. It is well made and easy to use. I trust it.
Sep 12, 2018
The spectrum range of this meter is 290 to 370 nanometers.. Calibration point is 365 nanometers. ...
The spectrum range of this meter is 290 to 370 nanometers.. Calibration point is 365 nanometers.
This makes it rather insensitive to my blacklight that emits at 395 nanometers which is close to the long end of UVA (400 nm)
Use it to monitor the UVA and UVB light from the Sun. It can show the instantaneous value and a choice of max, min or average simultaneously.
A powerful magnet makes it cling to any metal surface. Complicated menu but it will remember your last choice.
In general very good for the price, but not perfect.
+ as simple or complicated as you want + out of the box, immediate and useful readings - screws e...
+ as simple or complicated as you want
+ out of the box, immediate and useful readings
- screws expected to eventually strip the plastic wand if assembled/disassembled multiple times, according to manual
I live with blue-ish grow LEDs, used to live with MH, but am hoping to supplement only with HPS this winter if possible, due to an unknown amount of UV I've been subjecting myself to. At the moment I have no functioning MH lamps to test this with, or vice-versa, but it's not registering any UV from my HPS lamps which allegedly have *some* blues. I was surprised to get no registration in a windowed room on a very sunny summer day, but taking the meter outside got the numbers running faster than a gas pump about as soon as I opened the door.
Now I have to research *how much* UV is too much, if I want to run MH again this winter.
I've been avoiding a Quantum Meter due to the prices, and my refusal to buy more lights if the meter called for them; that said, if General Tools releases one, based on this UV meter I'd buy one in a heartbeat.
I ordered this device to measure the uva uvb from the sun and measuring. Uv light emissions from ...
I ordered this device to measure the uva uvb from the sun and measuring. Uv light emissions from man made light. And many other applications. The quality of the sensor is decent but has a calibration error and did not respond to My UV flashlight but it is ample good for outdoor and lab environment and this device will help me with day time photography to help pick and use the right type of uv filter home depot photo upload failed so no photos of product
If you need a handy UV AB light meter, this is an easy to use device with many features. I have ...
If you need a handy UV AB light meter, this is an easy to use device with many features. I have used it to measure the reduction in UV light transmission accomplished with sunglasses--and regular glasses. I will not go outside again without shades. I found that the reduction factor is approximately 100X.
The meter has a magnet concealed in the back behind the LCD display and a threaded tripod mount on the back of the meter as well. The meter comes with a padded case. In fact, I had to remove some of the pads to retrieve the manual and calibration certificate which were underneath. English was not the first language of the author of the manual, but the instructions were simple enough. Curiously, the sensor does not come preinstalled in the sensor wand. Installing the sensor requires careful routing of wire through the handle of the wand and installing five small screws. It is not a big deal and only has to done once, but it is still curious. The meter is powered by a 9-volt battery which is included but a little awkward to install.