Accurate to within a +/- .2 readout.

• Popular among universities and rose growers.

• Lasts for years when properly cared for.

The PHD is scientific and does not operate on batteries. Use in slightly moistened soil to get readouts you can depend on. 6.25" long overall, probe is 1 & 7/8" long. Blue plastic housing. Does not measure moisture like the HB2. These are not made for saline or alkaline soil with a pH over +7

QUESTION: How does the meter work? ANSWER: The meter utilizes a tiny flow of current through the two metal plates located on each side of the units housing.

QUESTION: Where can I get the green cleansing sheets to clean the Kelway Acidity Tester? ANSWER: Kelway deals direct in supplying these sheets. Call 201-847-8353, or write Kel Instruments, PO Box 54, Wyckoff, NJ 07481. They will not sell meters direct but do offer the cleansing sheets.

QUESTION: Can the meter be calibrated? ANSWER: When not in use the meter should read neutral at pH of 7. There is an adjustment screw in order to calibrate periodically if needed. QUESTION: Why test for soil acidity? ANSWER: Nutrients cannot dissolve in very acid or alkaline soil.

QUESTION: Why choose a direct reading soil tester? ANSWER: Litmus paper is not accurate enough and is difficult to use and interpret. Laboratory glass electrode ph meters require buffer solutions, temperature control, power sources,clean equipment and are very fragile. QUESTION: Where is this product made? ANSWER: It is made in Japan.