Solar Battery Charger with Sunlight Strength Meter and Built-in Light - Charges C, AA and AAA Batteries Each ruler has a hole

Each ruler has a hole on one end for hanging and comes with a protective sleeve for storage

and many other hobby and craft projects

Self-contained vacuum pump

An illustrated training manual is included

5KHz x 100-2KHz to150 KHz 23 frequency steps Output Control: 0 db

Solar Battery Charger with Sunlight Strength Meter and Built-in Light - Charges C, AA and AAA Batteries Each ruler has a holeCharges C, AA and AAA size batteries using the power of sunlight! Equipped with a meter that displays the strength of the sunlight, power output from the solar panel, and time it will take to fully charge the batteries Built in angle adjustable light that you can use at night for reading, finding lost items, bike or car repairs, or to locate your home's fuse box if there is a power failure Meter can register sun power up to 160mA and a blocking diode