We recommend that you do NOT use a Duracel battery. Any other alkaline battery should work fine. • Meter readout shows karat value ranges • Tests 10K, 14K, 18K, and 22-24K gold in all colors and identifies platinum • Helps to authenticate stainless steel Rolex cases and bands. Genuine Rolex stainless steel will test similar to platinum, as Rolex uses a special patented stainless steel. Fakes will generally test as not gold (red area on the meter) on the KEE tester. • Manual dial adjustment calibration using 18K yellow gold • Durable testing plate • Accessory clip for testing gold while being worn • Powered by 1 AA alkaline battery (no AC power option) • Includes: KEE tester, pen probe, file, AA alkaline battery, and accessory clip for remote gold testing • 6 Month Limited Warranty on KEE Tester, while the KEE Pen Probe has a 30 Day Limited Warranty