Equus 3721 Battery and Charging System Monitor

Inflated shipping cost (2008-06-28) Rating: 2/5
The shipping cost was doubled after I ordered this item. I will not order any products from this vendor again.
Worked fine intially, but it didn't last long (2008-06-18) Rating: 1/5
The numbers are clear even at night however after just 5 days of operation, the green back light died so I can't see anything at night. The meter still works so I can only use it during the day. I called their tech support and said that they'll replace this one if I return the faulty unit, however, I have to pay for the shipping! Since their product failed, I believe that they should be the one handling the return cost. Returning would already cost half the price I paid for this item.
Just what I was looking for (2008-04-28) Rating: 4/5
Good display. Accurate reading. Flexible viewing screen. Adapts to battery monitor or charging mode.
12 Volt battery Monitor (2008-04-16) Rating: 4/5
Seemingly just another auto gadget fortunately the Equus 3721 is more sophisticated than its ponderous description. 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 many newer vehicles.

With the engine running the instrument constantly displays battery condition with an LED light; amber when marginal, red if the battery is discharging. A green light indicates a correctly functioning electrical system. All is well with both battery and, most importantly, the alternator.

The Equus is also an accurate voltmeter. Digital read-outs give exact voltage in the electrical system. Potential alternator problems or a failing battery will be indicated by below normal voltages, plus an amber or red light. Extra information is a battery icon graphically showing total battery charge. Tending towards erratic read-outs, and therefore unreliability, it is not the unit's best feature.

Equus's instruction card is easy to understand. The unit is well made, sturdy, easy to connect and to transfer to any 12 volt system not having its own voltmeter. Also, as a supplemental monitor in an RV, or a bigger boat with a remote 12 Volt outlet in a sleeping area far from the main instrument panel, overall battery condition condition can be monitored while camping or at anchor.

Good value for money; very useful. From personal use, recommended.

good product (2008-04-11) Rating: 5/5
this product does exactly what I wanted. It is cheap, handy and does not require a technician to install- just plug it into your cigarette lighter.

I had alternator and battery problems in the past so I always want to know what is happening with these 2 areas.

I can reccommend this product to anyone whose vehicle does not have a built in voltmeter