Programmable 4 Digit Red LED AC/DC Volt Meter with Dual Control. Good for HHO System

Price: $37.50
  • SKUEPM-5740TVR
121 units available
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Key Features of the 5740TV Digital AC/DCVolt Meter


  • Support AC & DC to 500V and stable
  • Bright LED display
  • Movable decimal point
  • -1999 to 9999 (Display only)
  • Auto "zero" when nothing is input
  • Lower power consumption (<2Watt)
  • -3 level noise filtration
  • Built-in isolated power module
  • Overload display "1" or "-1"




  • Range: -500~+/- 500V (with negative sign "-")
  • Power: DC9V~30V +/- 10%
  • Current draw: 40mA~90mA<
  • Resolution: 0.1V
  • Power Frequency (not output): 0~400Hz
  • Temperature: 0-50'C
  • Sampling: 0.3s
  • Display: Red LED 0.56"
  • Dimensions: 79mm * 43mm * 58mm
  • Cutting: 76mm * 39.5mm
  • 3-Months Warranty



Average rating 8 out of 10 ( based on 5 reviews )

No instructions?

Review by on 1/17/2018

I have a few of these devices that in the review said poor documentation or no documentation and when I've gotten them I haven't been able to figure out how to program them not much good having something that you can't use because nobody will tell you how to program it I'm not going to buy this just because I see the reviews that say the documentation is so poor. Can't believe someone is selling a product and won't at least give information on how to hook it up so disappointed Reply: We did post support document on our support forum. It has been used for so many years to support our customers without much complain. It should serve well if you know a little electronics. If not, you should consult others who has electronics background

excellent battery charge or discharger controller

Review by mark on 11/10/2015

the instructions are very necessary when programming this device. i own 8 of them for various projects and still don't remember all the programming features by heart yet


Review by Tom on 12/3/2014

Good product...yes it's difficult to use without good instructions... Here are some How to use as bottom ballancer T

5740 volt meter

Review by bob podhradsky on 8/20/2012

great little controller i use it with a gig avac 150 amp relay as a charge controller with solar panels. lets me set any voltage on at 12v off at 15 volt back on when battery reach 12 on at 48v off at 58 volt or any voltage i set to 500 volt. i have 48 volt electric mower leave it hooked up with 2 solar panels with 5740 controlling charge all the time.

instructions are useless

Review by John on 2/6/2012

This gadget is very difficult to set up as the instructions are near to useless. There is nothing to tell you where to attach the wires. The customer service is useless.

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