http://www.ph-meter.co.cc/detail/hanna-instruments-hi-99121-direct-soil-and-water-p-B002NX0VYW
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.
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