Stewart's Corral continuation of "About me" (part 3) and Testing with Electrosmog meters |
page 34 visitor # |
Index | About Me and EHS | ||
Introduction and Awareness. Real or imagined About me, part 1 How it started About me, part 2 Ongoing saga |
Searching for EM-Smog Meter Evaluation Conversion chart and entry table Features to Look For Specifications Emissions More Meters Evaluation in Urban Measuring a cell phone |
Indoor Equipment Evaluation part 3 Measuring cellular and smartphones part 8 Spectrum analysis graphs part 7 |
LIBRARY— Health Links part 4, Book and video recommendations, Top research picks. |
The number of brain tumors is exploding by a factor of 20. Reduce your exposure! |
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Computer configuration being measured, case open, zero distance to cpu or boards | Acoustimeter | Cornet | GS units |
Micronics 09-00273-16 M55Hi Plus Socket7 Intel Pentium 167Mhz with 32Mb of RAM | 0.09 V/m | 0.008 mW/m² | US Power 85 gs |
Asus A7V8X-X Athlon2000, Nvidia GeForce 5900 Ultra | 0.18 V/m | 0.270 mW/m² | Aopen 192 gs |
Asus A7V8X-X Athlon2000, remove Nvidia | 0.036 mW/m² | Aopen 183 gs | |
Asus A7V8X-X Athlon2000, Change power supply | 0.091 mW/m² | Sunpower 120 gs | |
MSI K7T266 Athlon1700 | 0.21 V/m | 0.039 mW/m² | Aopen 230 gs |
Asus M4N68T-M Sempron140 2700Mhz | 0.09 V/m | Corsair 1999 gs | |
Asus M4N68T-M Sempron140 2700Mhz, Change power supply So it is not the motherboard that is the problem. . . it is getting a low-noise low-RF-emission power supply that does not generate dirty electricity. |
0.02 V/m | 0.009 mW/m² | Sunpower 210 gs |
Asus A7V880 Sempron3000, Nvidia GeForce 5200 This looks like the best I'm going to get. And it lasted many years. (The M4N68T-M bothered me more than the A7V880.) |
0.29 V/m | 0.166 mW/m² range: 0.112-0.240 |
Sunpower 155 gs |
2015: several years later, I'm ready to give it another go: | |||
Asus Sabertooth 990FX FX6300 3500MHz + Radeon R5 230A | 0.22 V/m | 0.45 V/m 0.537 mW/m² |
Raidmax >1999 gs |
Asus Sabertooth 990FX FX6300, Change power supply; SSR-350ST | 0.21 V/m | 0.29 V/m 0.227 mW/m² |
Seasonic 225 gs |
Asus Sabertooth 990FX FX6300, Change power supply; SSR-650RM | 0.21 V/m | 0.24 V/m 0.159 mW/m² |
Seasonic 145 gs |
Choosing the right power supply is better, but Not good enough. The Low-EMF specs did not produce the desired results. | |||
2018: years later again, now applying what I learned about SOC computers. (System On Chip) Focusing on Low-Energy motherboards, the lower the better. Energy efficient = Low emissions. | |||
ECS Elitegroup AMD A6-5200 Quad Core Processor Mini ITX DDR3 1600 Motherboard KBN-I/5200 , TDP is only 25 W + SSR-650RM |
0.10 V/m | 0.10 V/m 0.027 mW/m² |
Seasonic 98 gs |
and we have a winner! After 2 decades I can finally upgrade my desktop computer to something faster. |
2020: Let's take this one step further, how about a really small SOC that has no large power supply, and can run off-grid by DC battery? | |||||||||||||
device being measured | Acoustimeter at zero distance, and distance for audio to disappear | SSP2 | Zap Checker 180 at zero distance, and distance to get 5 at 10 | Cornet ED88T+ at zero distance ED85-EXS | Dr.Gauss at zero distance, and distance to get <= 0.2mG | TF2 peak (not moving) at zero distance, and radius of bubble | |||||||
Raspberry Pi 4B + Argon One case + Canakit 5V 3.5A USB power adapter (Wifi and BT turned off and blacklisted by modprobe) |
top aluminum 0.02 V/m 4 inches (10 cm) |
0.317 µW/m² 0.0003 mW/m² |
30 at sensitivity 6 4.5 inches (11 cm) |
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>10 mG 3 inches (8 cm) |
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bottom plastic 0.03 V/m 11 inches (28 cm) |
3.59 µW/m² 0.0036 mW/m² 0.037 V/m 5 inches (13 cm) |
90 at sensitivity 6 5 inches (13 cm) |
>10 mG 3.5 inches (9 cm) |
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The Canakit AC adapter made for the Pi adds 0 gs and 0 mV to the AC mains. It is possible to find a quiet wall wart for 5V USB power. | |||||||||||||
The Pi is not bad, the noise radius is manageable. I would Not recommend a plastic case or running without a case. I will have to keep my eye open for an all metal case. This also makes heat dissipation possible without fans. Only uses a few watts. 11 W at most. |
ATX Power Supply Unit being measured |
Acoustimeter at zero distance |
Cornet at zero distance |
GS meter (Graham-Stetzer) measuring line noise |
AOpen 250W | <0.02 V/m | Below thresholds <7.1 mV ADC |
155 alone 225-333 with ASUS A7V880 Athlon2000 1250MHz |
Coolmax 350W | 0.02 V/m | Below thresholds | 360 alone 940 with ASUS A7V880 Athlon2000 1250MHz |
Corsair CX430 | 0.09 V/m | Below calibrated threshold 7.5 mV ADC |
940 alone 1999 with ASUS M4N68T-M Sempron140 2700MHz |
Sunpower SAP-6300 300W | <0.02 V/m | Below thresholds | 130 alone 155 with ASUS A7V880 Sempron 2088MHz 168 with ASUS M4N68T-M Sempron140 2700MHz |
2nd Sunpower SAP-6300 300W hoping to duplicate first |
<0.02 V/m | Below thresholds | 535 alone 284-432 with ASUS A7V880 Athlon2000 1250MHz |
US Power 250W | <0.02 V/m | Below thresholds <7.1 mV ADC |
64 alone 85 with Micronics 09-00273-16 Pentium 167MHz |
several years later, I'm at it again, seeking a replacement motherboard: | |||
Raidmax RX-530SS | 0.04 V/m | 0.0518 V/m 10.3 mV ADC |
1900 alone >1999 (overload) with ASUS Sabertooth 990FX | 0.78 V/m at power cord, backfeeding into AC. |
Seasonic SSR-650RM Rated 80 PLUS Gold Certified |
<0.02 V/m | 7.2 mV ADC | 160 alone 225 with ASUS Sabertooth 990FX | 0.05 V/m at power cord, no backfeeding into AC. |
2017. My 17 year old Sunpower finally died. Here are the replacements I'm trying. | |||
Seasonic SSR-350ST Rated 80 Plus Bronze Certified |
0.09 V/m | 8.0 mV ADC | from 35 off to 840 GS on alone Didn't measure raw increase with ASUS A7V880 Athlon2000 but did measure 40 with GS filters on the line | 0.02 V/m at power cord, no backfeeding into AC. |
EVGA 450W Bronze | 0.03 V/m 9 inches (23 cm) |
Below thresholds <7.1 mV ADC |
>1999 alone (overload), so did not bother to test in computer | 0.02 V/m at power cord, no backfeeding into AC. |
Zap Checker: 40 @ 7 sensitivity 7 inches (18 cm) |
Mag-field: 294 mG and 9 inches radius E-field: 393 V/m and 4 inches radius. |
Seasonic SSR-550RW | 0.10 V/m 36 inches (91 cm) |
7.5 mV ADC | 1460 GS alone | 0.06 V/m at power cord, backfeeding into AC. | 35 @ 7 sensitivity 60 inches (153 cm) |
Mag-field: 244 mG and 9 inches radius E-field: 351 V/m and 3 inches radius. |
It just got worse and worse...the more I tried to find a quiet PSU... So the solution is to take the Seasonic SSR-650RM Gold certified PSU away from the backup Sabertooth case, and plug it into the primary computer, ah, much better. |
160 alone _?_ with ASUS A7V880 Athlon2000 |
device being measured | Acoustimeter at zero distance, and distance for audio to disappear |
Zap Checker 180 at zero distance, and distance to get 5 at 10 |
Cornet at zero distance |
GaussMeter at zero distance, and distance to get <= 0.2mG |
GS meter | TF2 peak (not moving) at zero distance, and radius of bubble |
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Asus A7V880 Nvidia Geforce FX5200 Sunpower 300W ATX power supply Lian-Li Aluminum tower case |
0.05 V/m outside of case = 0.007 mW/m² 2 feet (61 cm) |
60 at sensitivity 7 4 inches (10 cm) |
0.006 mW/m² -49.5 dBm |
1 mG 24 inches (61 cm) |
155 gs | ||||||||
Planar PL1700 LCD | 0.03 V/m = 0.002 mW/m² 12 inches (30.5 cm) |
90 at sensitivity 7 25 at sensitivity 6 6 inches (15 cm) |
Below calibrated threshold, Test mode detects approx≅ 0.0006 mW/m² |
6 mG 16 inches (41 cm) |
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Sound recording at front of monitor when on. | |||||||||||||
IBM 101 keyboard (upper right leds are hot spot) |
0.02 V/m 0.5 inch (1 cm) |
90 at sensitivity 9 30 at sensitivity 8 0.5 inch (1 cm) above keys: 50 at sensitivity 10 |
below thresholds | 0.19 mG | n/a |
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IBM 3-button mouse Model# M-S35 FRU Part# 76H6620 |
0.02 V/m 0.5 inch (1 cm) |
70 at sensitivity 10 40 at sensitivity 9 10 at sensitivity 8 3 inches (7.6 cm) |
below thresholds | 0.17 mG | n/a | ||||||||
Logitech 3-button mouse Model# M-CAA43 |
0.02 V/m 1.5 inch (4 cm) |
100 at sensitivity 7 20 at sensitivity 6 6 inches (15 cm) |
below thresholds | 5 mG 5 inches (13 cm) |
n/a | ||||||||
Logitech 3-button Trackman Marble+ Model# T-CL13 |
0.02 V/m 0.5 inch (1 cm) |
90 at sensitivity 7 65 at sensitivity 6 12 inches (30 cm) |
Below calibrated threshold, Test mode detects approx≅ 0.0005 mW/m² |
0.6 mG 3 inches (8 cm) |
n/a | ||||||||
Canon Pixma iP6220D inkjet printing |
0.23 V/m = 0.140 mW/m² 12 feet (365 cm) |
90 at sensitivity 7 11 inches (28cm) |
0.019 mW/m² -45.0 dBm when printing |
7 mG 24 inches (61 cm) |
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ActionTec 56k dialup modem | 0.07 V/m = 0.013 mW/m² 5 feet (152 cm) |
90 at sensitivity 1 3.25 feet (100 cm) |
0.002 mW/m² -54.3 dBm |
10 mG | |||||||||
Reference levels | |||||||||||||
Background levels, middle of room electric field = 100 - 500 mV AC depending on location and proximity to grounded objects |
<0.02 V/m | 2 at sensitivity 10 | below thresholds | 0.15 mG | n/a | M 0.0 mG E 0 V/m RF 0.000 mW/m² |
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Background levels, middle of forest valley electric field = 0 mV AC |
<0.02 V/m | 2 at sensitivity 10 | below thresholds | 0.15 mG | n/a | below thresholds | |||||||
2017: My quiet Planar finally broke, so I'm on the hunt for a new monitor. | |||||||||||||
Panasonic TC-L42U22 42 inch flat screen LCD HDTV |
front 0.02 V/m 12 inches (30 cm) |
90 at sensitivity 9 40 at sensitivity 8 2 feet (61 cm) |
Below calibrated threshold | 2 - 14 mG 3 feet (91 cm) |
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back 0.09 V/m = 0.021 mW/m² 11 feet (335 cm) |
40 at sensitivity 10 8 inches (20 cm) |
0.003 mW/m² -52.8 dBm |
6 - 14 mG 3 feet (91 cm) |
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Viewsonic VX2376-SMHD 23" IPS 1080p |
front 0.03 V/m 9 feet (274 cm) |
80 at sensitivity 6 9 inches (23 cm) |
0.0006 mW/m² 8.0 mV ADC |
3 mG 11 inches (28 cm) |
36 V/m 4 feet (122 cm) |
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back 0.07 V/m = 0.013 mW/m² 11 feet (335 cm) |
10 at sensitivity 5 100 at sensitivity 6 11 inches (28 cm) |
0.007 mW/m² 17.0 mV ADC |
28 mG |
41 V/m | |||||||||
2018: The Viewsonic became louder over time, so looking again for a quiet monitor, trying Planar again, since it was so good in the past. | |||||||||||||
Planar PLL2410W 24" LED LCD 1080p |
front 0.02 V/m 30 inches (76 cm) |
85 at sensitivity 8 3 inches (8 cm) |
Below calibrated threshold 7.2 mV ADC |
17 mG 13 inches (33 cm) |
32 V/m 9 inches (23 cm) |
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back 0.02 V/m 30 inches (76 cm) |
90 at sensitivity 8 5 inches (13 cm) |
Below calibrated threshold 7.2 mV ADC |
23 mG 20 inches (51 cm) |
36 V/m 7 inches (18 cm) |
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device being measured | Acoustimeter at zero distance, and distance for audio to disappear |
Zap Checker 180 at zero distance, and distance to get 5 at 10 |
Cornet at zero distance |
GaussMeter at zero distance, and distance to get <= 0.2mG |
Cornet E field | TF2 peak (not moving) at zero distance, and radius of bubble | |||||||
The column header is changing, as better test equipment is acquired over the years. 2021: Can I find an off grid solution? Testing for a quiet 5V monitor: | |||||||||||||
device being measured | Acoustimeter at zero distance, and distance for audio to disappear | SSP2 | Zap Checker 180 at zero distance, and distance to get 5 at 10 | Cornet ED88T+ at zero distance ED85-EXS | Dr.Gauss at zero distance, and distance to get <= 0.2mG | TF2 peak (not moving) at zero distance, and radius of bubble | |||||||
NexiGo NXG-PMFHD15 15.6" QLED IPS 1080p HDMI USB-C powered |
front, from HDMI plug 0.06 V/m 10 feet (305 cm) |
5.55 µW/m² 0.0056 mW/m² 0.046 V/m 4.25 feet (130 cm) |
100 at sensitivity 6 20 at sensitivity 5 6 inches (15 cm) |
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8 mG 4 inches (10 cm) |
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This HDMI cord was the source of a serious problem. It will require a better shielded cord to make this work. When the HDMI cord is unplugged, the radius drops to 6 inches (15 cm) and the sound changes completely. Of course the signal processor is now turned off, so it may be difficult to separate the two noise sources. This NexiGo monitor makes me feel sick, I'm calling this test a failure. | |||||||||||||
The Acoustimeter and SSP meters are clear winners in measuring the radius of noise bubbles. |
Make and model of Heater | Acoustimeter | Cornet | Dr. Gauss Meter | GS meter |
Crest ceramic HEAT 1500W | 0.02 V/m | below thresholds | 0.2 mG at 2-3 ft. 10 mG at 4 in. 75 mG at 0 ft. | no change |
EdenPure model 3 | 0.02 V/m | below thresholds | 0.2 mG at 7 ft. 10 mG at 2 ft. | |
Delonghi 5108 (c.1990) LOW setting | <0.02 V/m | below thresholds | 0.2 mG at 18 in. 10 mG at 7 in. 29 mG at 0 ft. | no change |
Delonghi 5108 (c.1990) HIGH 1500W setting | 0.2 mG at 2 ft. 10 mG at 8 in. 61 mG at 0 ft. | |||
Delonghi EW7707CM (2011) HIGH 1500W setting | <0.02 V/m | below thresholds | 0.2 mG at 3 ft. 10 mG at 16 in. 68 mG at 0 ft. | no change |
Make and model of Kitchen appliance | Acoustimeter | Cornet | GaussMeters | GS meter |
Frigidaire (c.1990) measured from back | <0.02 V/m | below thresholds | 0.2 mG at 8 ft. 10 mG at 3 ft. | no change |
Frigidaire measured from front | 0.2 mG at 4 ft. 10 mG at 12 in. | |||
Oster 10-speed blender 641-13J (1969) | 0.08 V/m | 0.005 mW/m² | 0.2 mG at 7 ft. 10 mG at 13 in. 110 mG at 1 in. 200 mG at 0 ft. | 1060 gs |
Oster Regency Kitchen Center 970-04A (c.1980) | 0.20 V/m 0.03 V/m at 10 ft. | 0.013 mW/m² | 0.2 mG at 9 ft. 10 mG at 18 in. >200 mG under 2 in. | 360 gs |
Vitamix (2010) | 0.08 V/m | 0.007 mW/m² | 0.2 mG at 13 ft. 10 mG at 3 ft. 121 mG at 0 ft. | |
Oster 16-speed blender 6812 (2010) | 0.39 V/m | 0.061 mW/m² | 0.2 mG at 6-9 ft. | 400 gs |
Oster BLSTCF-BCC blender, all metal drive (2010) 1st unit had a defective gasket in the jar | 0.15 V/m 0.05 V/m @ 10 ft. | 0.021 mW/m² | 0.2 mG at 4 ft. 84 mG at 0 ft. | 350 gs |
Oster BLSTCF-BCC blender, all metal drive (2010) 2nd (replacement) not the same EMF! | 0.40 V/m 0.06 V/m at 3 ft. | 0.055 mW/m² | 0.2 mG at 10 ft. 10 mG at 4 ft. 122 mG at 0 ft. | 320 gs |
JetStream 2000 Convection Oven (2002) HIGH setting | 0.21 V/m | 0.061 mW/m² | 0.2 mG at 4 ft. 1.0 mG at 18 in. 10 mG at 12 in. 200 mG at 0 in. | no change |
Nuwave Infrared Convection Oven 20304, 20322 (2008) magnetic field is: strongest front and back, but lower strength at sides (4ft instead of 9ft) | <0.02 V/m | below thresholds | 0.2 mG at 9 ft. 1.0 mG at 51 in. 10 mG at 20 in. >200 mG under 2 in. | no change |
Make and model of Air filter | Acoustimeter | Cornet | GaussMeters | GS meter |
Duracraft HEPA200 DA-5020 with Ionizer OFF Fan=LOW | <0.02 V/m | below thresholds | 0.2 mG at 4 ft. 1.0 mG at 18 in. 10 mG at 5 in. 29 mG at 0 ft. | no change |
Duracraft HEPA200 DA-5020 with Ionizer ON Fan=SUPER High (Fan speed only affects magnetic readings) | 0.60 V/m | 0.014 mW/m² | 0.2 mG at 6 ft. 1.0 mG at 26 in. 10 mG at 8 in. 57 mG at 0 ft. | adds 13 gs |
device being measured | Acoustimeter at zero distance, and distance for audio to disappear |
Zap Checker 180 at zero distance, and distance to get 5 at 10 |
Cornet at zero distance |
GaussMeter at zero distance, and distance to get <= 0.2mG |
GS meter | TF2 peak (not moving) at zero distance, and radius of bubble |
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Pro3 Radon Detector | 0.22 V/m 12 inches (30 cm) |
60 at sensitivity 10 5 inches (13 cm) |
Below calibrated threshold, Test mode detects approx≅ 0.0009 mW/m² |
9 mG 24 inches (61 cm) |
depends on transformer model |
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808 #16 Keychain Mini DVR | 0.06 V/m 5 feet (152 cm) |
80 at sensitivity 6 (bottom) 20 at sensitivity 5 (top) 6 inches (15 cm) |
0.010 mW/m² | 12 mG 2.5 inches (8 cm) |
n/a | ||||
Sound recording of Power On, Auto Record 10 sec. Shutter off. Power Off. | |||||||||
Mobius Action Cam DVR | 0.38 V/m top 0.13 V/m bottom 9 feet (274 cm) |
30 at sensitivity 6 (bottom) 50 at sensitivity 5 (top) 8 inches (20 cm) |
0.032 mW/m² | 9 mG 2 inches (5 cm) |
n/a | ||||
Sound recording of Power On, Auto Record 10 sec. Shutter off. Power Off. | |||||||||
Carcam HD Car DVR pre-IR night vision and HDMI |
0.11 V/m 10 feet (304 cm) |
100 at sensitivity 6 10 at sensitivity 5 8 inches (20 cm) |
0.020 mW/m² | 5 mG 5 inches (13 cm) |
n/a | ||||
EZO Power USB 5200mAh Li-Ion battery |
0.06 V/m 8 inches (20 cm) FM radio: 12 ft. (366 cm) |
30 at sensitivity 4 6 inches (15 cm) |
Below calibrated threshold, Test mode detects approx≅ 0.0015 mW/m² |
0.6 mG 1 inches (2.5 cm) |
n/a | ||||
6000 T-Pocket Power 5000mAh Li-Lipo battery USB (4 blue leds) |
0.23 V/m 49 inches (124 cm) FM radio: 12 ft. (366 cm) |
40 at sensitivity 6 13 inches (33 cm) |
Below calibrated threshold, Test mode detects approx≅ 0.0017 mW/m² |
3.5 mG 2.5 inches (6.4 cm) |
n/a | ||||
Solar Charger USB 2600mAh Li-Po battery |
<0.02 V/m 1 inch (2.5 cm) |
5 at sensitivity 10 0 inch (0 cm) |
Below thresholds | 4 mG 2 inches (5 cm) |
n/a | ||||
Just Mobile PP-08 Mobile Power Pack 4400mAh Li-Po battery |
<0.02 V/m 0 inch (0 cm) |
75 at sensitivity 7 3 ft. (91 cm) |
Below thresholds | 0.2 mG 0 inches |
n/a | ||||
Auto USB Charger N10117 Z528 | <0.02 V/m 0 inch (0 cm) |
10 at sensitivity 10 0 inch (0 cm) |
Below thresholds | 0.22 mG 0.1 inches (0.2 cm) |
n/a | ||||
Mains AC Adapter USB Charger Model KY-758 | 0.76 V/m 10 inches (26 cm) |
15 at sensitivity 10 5 inches (13 cm) |
Below calibrated threshold, Test mode detects approx≅ 0.0012 mW/m² |
10.5 mG 15 inches (38 cm) |
113 gs | ||||
Mains AC Adapter USB Charger Model KY-02 | 0.65 V/m 7 inches (18 cm) |
15 at sensitivity 10 2 inches (5 cm) |
Below thresholds | >13 mG 12 inches (30 cm) |
230 gs | ||||
Mains AC Adapter USB Charger No-name brand | 0.22 V/m 7 inches (18 cm) |
10 at sensitivity 10 1 inch (3 cm) |
Below calibrated threshold | >13 mG 8 inches (20 cm) |
+135 gs +1400 under load Poor harmonic filtering |
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110V-240V AC Adapter 5V 1A USB Charger No-name brand with Model: ZY-T030 | 0.12 V/m 3 inches (8 cm) |
16 at sensitivity 10 2 inches (5 cm) |
Below calibrated threshold | 6 mG 6.5 inches (17 cm) |
+80 gs +1950 under load NO harmonic filtering |
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Mains AC Adapter USB Charger ITE Model 1128 for Microsoft | 0.18 V/m 2 inches (5 cm) |
16 at sensitivity 10 4.5 inches (11 cm) |
Below calibrated threshold | 7 mG 2 inches (5 cm) |
+0 gs +75 under load |
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Mains AC Adapter USB Charger JJS Model A1265 | 0.06 V/m 3.5 inches (9 cm) |
7 at sensitivity 10 1 inch (2 cm) |
Below calibrated threshold | >13 mG 6.5 inches (17 cm) |
+15 gs +860 under load, LOW voltage= 4.5V Poor harmonic filtering |
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Anker PowerPort2 USB Charger Model A2141 | 0.06 V/m 1 inch (2 cm) |
6 at sensitivity 10 2 inches (5 cm) |
Below calibrated threshold | 7 mG 4 inches (10 cm) |
+0 gs +20 under load |
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Canon Powershot A620 digital camera DIGI-2 processor |
0.03 V/m 7 inches (18 cm) |
100 at sensitivity 6 10 at sensitivity 5 1 inch (2.5 cm) |
Below calibrated threshold, Test mode detects approx≅ 0.0010 mW/m² |
13 mG 9 inches (23 cm) |
n/a | ||||
Canon Powershot A650 digital camera DIGI-3 processor |
0.02 V/m screen off 0.05 V/m screen on, focusing 5 inches (12 cm) |
90 at sensitivity 7 1 inch (2.5 cm) |
0.003 mW/m² -52.8 dBm |
>14 mG 9 inches (23 cm) |
n/a | ||||
Canon Powershot SX110 digital camera DIGI-3 processor |
0.03 V/m screen on 18 inches (46 cm) |
85 at sensitivity 7 3 inches (7.6 cm) |
Below calibrated threshold, Test mode detects approx≅ 0.0007 mW/m² |
6 mG 4 inches (10 cm) |
n/a |
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ehs2.html | Updated 2022.Dec.26 |