Bluelab Replacement pH Probe for Guardian, Combo, & pH Meter spl_cp and can be used with

and can be used with a wide variety of garden soils and potting mixes

and improves germination by warming the root area 10-20°F over ambient temperature

twist and lock

and temperature measurements in a single tester

Bluelab Replacement pH Probe for Guardian, Combo, & pH Meter spl_cp and can be used withEasy to clean because of its bullet shaped glass bulb. Fully waterproof and less fragile than all glass electrodes because of its tough polypropylene barrel. Gel filled (non refillable) making it maintenance free and a double junction reference providing longer life! Probe Tips All probes are interchangeable between all Bluelab products All probes carry a 6 month warranty Proper hydration of pH probes is vital to maintain wick All pH probes eventually