Hanna Replacement Probe for Grochek HI9813-5N & HI9811-5N spl_bfg TDS readings are performed by

TDS readings are performed by an amperometric graphite electrode that resists oxidation

Please avoid storing in direct sunlight and protect from freezing

These don't look like the ones from the hydro store because they are double-junction

24 Hour Timer (on/off with inverse function)

Hanna Replacement Probe for Grochek HI9813-5N & HI9811-5N spl_bfg TDS readings are performed byThis pH EC TDS temperature probe probe features a fiber junction and gel electrolyte making it ideal for fertilizer solutions. It is a replacement electrode for the GroChek series " 5" models: HI9813 5 & HI9813 5N, and is designed for simplicity of use in taking pH, mS cm, ppm and temperature in the C scale measurements. The meter the probe supports is a versatile, water resistant, multiparameter portable instrument specifically designed for