... 1.Has the advantages of waterproof, moisture-proof, anti-jamming and temperature resistant. 2.IP57 Water Proof pH TransmitterIntroduction & Feature1 ... -D pH Combination Electrode, has the advantage of anti-jamming, especially suited for pH measurement in complex environment conditions. ... reference electrode double megohm, has the advantage of anti-jamming, can be used with Model HT2513 and Model 2615 ...