Schumacher Electric 100A Car Battery Load Tester and Voltmeter, Charging System Diagnosis, 6V/12V Sport, Auto, and Marine Batteries, BT-100

I've used both the testers from the old days, newer ones and now this one. This is the best. It's light weight and the best part is the red button. Huge improvement! The scale readout itself is much better. You still have to have a fast eye but you will know even better where your battery stands. Get one. You might save yourself some serious cash over the cost of having to replace a battery. Saving just one battery is well worth it.

I'm a do it yourselfer and responsible for keeping our three vehicles in top running order. Over the years I used a basic multi-meter to monitor battery/alternator voltage. However, I was never was able to perform a load test unless I had my wife or son crank while I read multi-meter. I recently had an a cranking issue with one of the vehicles. Although the battery reflected 12.4 volts(engine not running) it simply wouldn't crank. After checking alternator output and ruling out starter, I realized that I had experienced this issue before...weak/damaged battery. Rather than waiting for my wife to return from work to perform the load test I decided to buy the the BT-100 at a local store. Bought the BT100 and charged the battery. Hooked up the BT-100 and performed the load test. Just as I thought, the battery was a goner. The BT100 is a vital tool to assist any user with keeping their auto in top running shape. Performing easy maintenance testing using the BT-100 will prevent potential no starts down the road. It's easy to use this tool. I highly recommend the BT-100.