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• Light sensor
This guarantees absence of heavy metals or other contaminates
5V button cell batteries (included) (model LR44 or equivalent)
where it is already recognized and regulated by EPA
Use a 1/8 inch layer as a top dressing around plants
HM Digital AquaPro TDS/Temperature Meter complete-systems • Light sensorFEATURES Measures total dissolved solids (TDS) and temperature Automatic Temperature Compensation (ATC) Water resistant housing Measurement Range: 0 5000 ppm Digital Calibration (push button) Auto off function, data hold function and low battery indicator Display: large and easy to read LCD screen includes simultaneous temperature reading The AquaPro is calibrated with a 342 ppm NaCl solutioncan be recalibrated with digital calibration using the push
