Hardly any vehicles these days come with voltmeters that continuously read the battery voltage. Digital voltage readouts are available as aftermarket items and are not difficult to install. But, even if you have an aftermarket digital voltmeter they only hold their readouts for the display update time which is only a fraction of a second. Because the lowest cranking voltage occurs very quickly a digital voltage display won't reliably detect the lowest voltage and hold it the way the Optimate does. THIS IS THE BEST INEXPENSIVE TOOL TO SHOW THE CRANKING VOLTAGE. A thousand-dollar digital storage oscilloscope would be better... but you can't throw one of those into a motorcycle hard case for portable use. Use this tool to check the resting, cranking, and charging voltages occasionally, jot them down in a logbook, and this ONE TOOL will give you an indication of the health of your motorcycle battery, alternator, and starter. If it shows that everything is ok it will provide peace of mind. If it shows your battery, alternator, and starter are dead or dying, it will pay for itself by telling you where to troubleshoot. This tool is recommended by Tracy Martin in his book on Motorcycle Electrical Systems. BTW, I have a 5-year-old Shorai lithium battery in my bike, and this works perfectly with it. My resting volts are in the green (around 13.4 volts) (lithiums are higher than lead-acids), my alternator output voltage is in the green (14.1 volts), and my starting voltage is 8 volts... in the yellow. But everything else is ok and the bike starts just fine, so I'm not worried.
Rating: [5 of 5 Stars!]