The specs of ‘Equus 3721 Battery and Charging System Monitor’ are:

  • Manufacturer: Equus
  • Product Dimensions: 10×4.2×1.5 inches
  • Shipping Weight: 0.2 pounds

Here are some REAL customer reviews:

“Great value, good product”

The picture on Amazon site is not correct. This battery monitor shows the voltage value with .01 precision (or two digits after decimal point). That is far more then enought to tell the battery status. I put it in the car, it automatically switches…Read more

“12 Volt battery Monitor”

Seemingly just another auto gadget fortunately the Equus 3721 is more sophisticated than its ponderous An honest review of Equus 3721 Battery and Charging System Monitor by multiple REAL users of Equus 3721 Battery and Charging System Monitor. Tell us what you think ;)ription. A breeze to connect to any car's 12 Volt electrical system. Simply push into the lighter socket or an auxiliary power outlet now found in…Read more

“Problem unit”

I purchasted this unit to use in a small aircraft that has no built in battery monitor.The unit failed within one hour of use.It was too cheap to bother to send back so I took it apart.I found two loose screws holding the circuit board…Read more