Home / Shop / Batteries, Testers and Tools / ZPower 312 View cart “Hearing Aid Battery Tester” has been added to your cart. $40.00 ZPower 312This product is no longer available. Size 312 battery. Rechargeable Out of stock SKU: 52066-1 Category: Batteries, Testers and Tools Tag: Copied From Estes Related products Battery Easy $9.99 Read more 40 Rayovac Premium Batteries: Size 10 Yellow $20.00 Add to cart Mirror-Go-Round $15.00 Add to cart Westone TRU Hearing Protection $25.00 Add to cart