Item No.: B15AF055
.Quickly determine percentage of moisture in brake fluid.   
.Measurement range: brake fluid (DOT 4).   
.Power supply: 1.5V "AAA" x 1 .   
.5 LEDs indicating the water % in the brake fluid.   
.5 LEDs indicating the water % in the brake fluid:
.0% light indicates that the battery is OK, no replacement.
.1% light indicates that moisture content of brake oil less than 1% ,
brake fluid has a good performance, and ease of use.
.2% light indicates that moisture content of brake oil less than 2%,
brake fluid can be continued to use
.3% light indicates that moisture content of brake oil less than 3% ,
proposed to replace brake fluid.
.4% light indicates that moisture content of brake oil less than 4%,
 brake fluid should be replaced immediately."