Change batteries less often—these last at least twice as long as standard lantern batteries. Use them to power lanterns, barricade lights, and telecommunications devices. Because they are zinc air batteries, they require oxygen to create power. Activate by removing the tape from the holes in the battery case, allowing oxygen to flow inside. They maintain voltage at a constant level, even during power peaks and pulses that can temporarily drain oxygen. Mount in any position with access to air.

Power portable lighting such as lanterns, flashlights, and barricade lights. When choosing a battery, use the capacity, measured in milliampere-hours, to compare among similar sizes. The higher the mA-hr. rating, the longer the battery should last.

Accurately measure the density and concentration of liquids—from salt water to battery acid—no calculating or reading scales required. These meters show readings immediately on their digital display. They only require 2 mL of liquid, less than half of a teaspoon, to take precise measurements. Switch between Specific Gravity, Brix, and other measurement units depending on your sample. These meters have an RFID interface, so you can quickly scan sample IDs on containers to identify liquids. They also have Bluetooth to send data wirelessly to your PC or printer. Store up to 1,200 readings, including sample IDs and time stamps, in their memory.

To measure liquids, these meters come with a filling tube and multiple syringes. Dip the filling tube directly into your sample to draw up liquid, or use a syringe to transfer your sample to the meter.

Designed for the field, these meters are IP54 rated, so they stand up to dust and splashing water.