Lascells Digital Ammeter. Low power consumption .Auto Off.Fewer flat batteries Spend Less time changing batteries with the new Lascells Bench Meters. These Digital Bench Meters are housed in robust ABS and PVC cases. Both feature 50 minute ‘auto off’ circuitry to conserve battery life and an LED indicator prompting battery change when necessary. Supplied with 9V PP3 Battery and full instructions.