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04-25-2019, 12:34 PM
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#1
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Senior Member
Join Date: May 2018
Location: Hills of Northwestern PA
Posts: 2,329
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Inexpensive plug in voltmeter
I mentioned using a simple plug in digital LED voltmeter in some other threads so I thought I would show it. Amazon prime $9.48. It appears to be reading 3 volts low compared to my PS EMS30 (121vac) vs. plug in meter (118vac). Checked the two accessible outlets inside. Plug in read the same. Checked those outlets with my Harbor Freight digital meter (119.3vac). EMS30 said 1 amp. Only load was the 12VDC converter and small electronic dehumidifier.
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2019 Cherokee Wolf Pup 16BHS flipped axle, 5K springs, 400AH LiFePO4, 3K inverter, 400 watts CIGS solar
2019 Ford F-150 S-Crew 5.5 bed V8 w/tow package, ITBC, Tow Mirrors, 3.55, SumoSprings, 7000# GVWR, 1990#CC
Husky Centerline TS WDH 400-600# spring bars
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04-25-2019, 12:58 PM
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#2
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Pickin', Campin', Mason
Join Date: Aug 2015
Location: South Western PA
Posts: 19,146
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Those DM55-1 voltmeters are good to check voltage at a glance.
I have two that I keep plugged in in different places. I can tell at a glance, when the A/C kicks in or the microwave is on, what the voltage is.
They do have a calibration pot inside if you choose to make it the same as a verified meter.
Oh... and they are like $3.50 on eBay w/free shipping.
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2022 Cedar Creek 345IK 5th Wheel•Solar & Inverter•2024 Ford F-Series SCREW•7.3L•4x4•Factory Puck•B&W Companion•TST Tire Monitor w/Repeater•Sinemate 3500w Gen.
F&AM Lodge 358 Somerset, PA - JAFFA Shrine - Altoona, PA
Days Camped ☼ '19=118 ☼ '20=116 ☼ '21=123 ☼ '22=134 ☼ '23=118☼ '24=90
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04-25-2019, 01:02 PM
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#3
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Senior Member
Join Date: May 2018
Location: Hills of Northwestern PA
Posts: 2,329
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Quote:
Originally Posted by 5picker
Those DM55-1 voltmeters are good to check voltage at a glance.
I have two that I keep plugged in in different places. I can tell at a glance, when the A/C kicks in or the microwave is on, what the voltage is.
They do have a calibration pot inside if you choose to make it the same as a verified meter.
Oh... and they are like $3.50 on eBay w/free shipping.
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$3.50, damn! Might have to get a couple more. If I had a true calibrated meter, I would make those meters as true as I could.
__________________
2019 Cherokee Wolf Pup 16BHS flipped axle, 5K springs, 400AH LiFePO4, 3K inverter, 400 watts CIGS solar
2019 Ford F-150 S-Crew 5.5 bed V8 w/tow package, ITBC, Tow Mirrors, 3.55, SumoSprings, 7000# GVWR, 1990#CC
Husky Centerline TS WDH 400-600# spring bars
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04-25-2019, 01:05 PM
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#4
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Pickin', Campin', Mason
Join Date: Aug 2015
Location: South Western PA
Posts: 19,146
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Quote:
Originally Posted by Boomerweps
$3.50, damn! Might have to get a couple more. If I had a true calibrated meter, I would make those meters as true as I could.
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Here you go... buy in quantities of more than one and they are even less..
DM55-1 on eBay
__________________
2022 Cedar Creek 345IK 5th Wheel•Solar & Inverter•2024 Ford F-Series SCREW•7.3L•4x4•Factory Puck•B&W Companion•TST Tire Monitor w/Repeater•Sinemate 3500w Gen.
F&AM Lodge 358 Somerset, PA - JAFFA Shrine - Altoona, PA
Days Camped ☼ '19=118 ☼ '20=116 ☼ '21=123 ☼ '22=134 ☼ '23=118☼ '24=90
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04-25-2019, 01:08 PM
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#5
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Senior Member
Join Date: Apr 2012
Posts: 1,472
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Voltage on Prog. EMS is before it enters converter. Accuracy on HF meter may be no more accurate than a $3.50 plug in meter. Don't know which value I would calibrate to.
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You can avoid reality, but you cannot avoid the consequences of avoiding reality – Ayn Rand
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04-25-2019, 01:11 PM
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#6
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Pickin', Campin', Mason
Join Date: Aug 2015
Location: South Western PA
Posts: 19,146
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Quote:
Originally Posted by bob213
Voltage on Prog. EMS is before it enters converter. Accuracy on HF meter may be no more accurate than a $3.50 plug in meter. Don't know which value I would calibrate to.
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I set mine to this...
__________________
2022 Cedar Creek 345IK 5th Wheel•Solar & Inverter•2024 Ford F-Series SCREW•7.3L•4x4•Factory Puck•B&W Companion•TST Tire Monitor w/Repeater•Sinemate 3500w Gen.
F&AM Lodge 358 Somerset, PA - JAFFA Shrine - Altoona, PA
Days Camped ☼ '19=118 ☼ '20=116 ☼ '21=123 ☼ '22=134 ☼ '23=118☼ '24=90
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04-26-2019, 10:03 PM
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#7
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Senior Member
Join Date: Jul 2017
Location: Central Upstate NY
Posts: 148
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I bought one of those cheapie AC voltmeters and checked it against my Fluke; while not "dead nuts", it required no adjustment. I leave it plugged into the outlet that is visible when I enter the TT
Just below that, I installed an even cheaper DC voltmeter so I can monitor that battery. I sort of over-engineered this... measure a dozen times and cut once.  It will help to keep me apprised of the battery's charge level. This also checked very close to the Fluke, so it's all good.  
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04-27-2019, 03:40 PM
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#8
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Retired Old Fart
Join Date: Nov 2018
Location: McDonough, GA
Posts: 971
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Hard to beat a Fluke meter. I love my Fluke 177.
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Just the 2 of us in a...
"Currently between trailers"
Sold the 246RKS in 2023
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04-27-2019, 04:53 PM
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#9
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Senior Member
Join Date: Aug 2013
Posts: 7,916
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X2 on the fluke....I guess Simpson would be as accurate. I bought a few of these cheap deals, but haven’t used them yet. I wouldn’t be concerned of 2-3 volts. It’s just for reference to me.
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2017 Puma 297RLSS
2005 Ram 2500 4X4 diesel SMOKER!!
I love puns, irony and tasteless jokes...
born in Texas.... live in Arkansas 
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