Palmer Instruments' pressure gauge is powered by a built-in solar cell
Palmer Instruments' solar-powered pressure gauge has a 5/8-inch-high LCD screen. Powered by a built-in solar cell, even a flashlight is enough to power this unit; batteries never need replacing. Models are available with or without 4-20 mA transmitter capability for connection to a remotely installed controller or recorder. IP65 Weatherproof rating makes this gauge ideal for exterior installations. Available in ranges from vacuum to 1,000 psi, as well as PSI, kPa, KG/CM2 or Bar with corresponding Vacuum scales, the Palmer Solar Pressure Gauge is available with ¼" NPT or ½" NPT lower connection fittings.