Schumacher BT175 Digital 12V Battery Tester Hand-held tester checks the battery, starting, and charging systems with digital accuracy Digital display guides you through the testing process and shows voltage and CCA LEDs indicate OK, OK & Recharge, Recharge & Retest, Weak, Bad Battery, and Error For 12V SLI and VRLA/AGM/GEL batteries Operating range: 100-1200 CCA (SAE)