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Hanna Instruments HI 99121 Direct Soil pH Meter. The HI99121 was designed to specifically work for pH and temperature analysis of water and soil. The special HI1292D electrode is designed with a spherical tip to allow it to pentrate into soil . This is a popular meter for growers and landscapers. The electrode is made of glass so basic care is recommended. The pH range is -2.00 – 16.00 pH. Temperature range is Temp range is 23.0 – 220 0F. Hanna Instruments HI 99121 Direct Soil pH Meter