Analog Handhelds Measuring EC and pH
Plant health can be greatly affected by pH (acidic or basic), salinity (soluble salts), and alkalinity, yet these
factors are often ignored by growers. It is easy to test for these three important parameters using a portable
Myron L® AGRI-METER.
AGRI-METERS™ for Soil Analysis
Optimum soil pH is essential for obtaining maximum efficiency from fertilizers and herbicides.
This is especially true for artificial growing media which, without buffering capability, are much more pH
sensitive than natural soil. In addition, the pH of artificial soils can vary greatly when new, and must be
adjusted (leached) before use.
Dissolved salts (salinity) in soil must also be monitored to guarantee healthy plants. Salt build-up in soil can
be due to high TDS (total dissolved solids) in water, excess fertilizer, or poor drainage. Each plant has its
own salinity tolerance level. If excessive salts accumulate in the soil, roots will take in little or no soil
solution, resulting in reduced plant growth and quality.
Using a Myron L® Model AG6/PH for checking soil salinity and pH is easy. Simply mix one part soil with two parts
pure water. Some organic media, such as peat moss, need a 5:1 water:soil dilution ratio. Only a heaping
tablespoon of soil is required. Agitate container vigorously. Let settle for 45-60 minutes and decant the water
into the instrument cell cup. Push buttons to read directly in millimhos/ conductivity (salinity) and soil pH.
Fertilizer Solutions Analysis
Regular testing of conductivity ensures that fertilizer solutions will contain the optimum level of salinity for
maximum plant health and growth. If a fertilizer injection system is used, it can be easily checked with an
AGRI-METER by taking a sample solution as it comes out of the end of the hose or “spaghetti” irrigation tubes.
Proper adjustment of the fertilizer injector can prevent these common problems: over or under feeding, plant
damage and fertilizer waste.
Water Analysis for Agriculture
Water pH can vary greatly from month to month because of rainfall effects on the aquifer. Irrigation water, if
high in soluble salts, can increase soil salinity causing plant damage. AGRI-METER tests water pH and salinity
easily and quickly, and readings are given directly in millimhos/conductivity. The correct pH of water used in
pesticide solutions is also important in order to ensure maximum effectiveness and prevent pesticide “break
Alkalinity tests are critical to proper pH adjustments of water and floral preservative solutions.
Both AG-5 and AG6/pH AGRI-METERS are calibrated in millimhos, the term most widely used by growers to express
electrical conductivity. Some charts may read in other units called micromhos. However, since one millimho
equals 1,000 micromhos, conversion is easy. Parts per million (ppm) is also sometimes used. Conductivity/ ppm
fertilizer concentration tables can be obtained from your supplier, consultant, or university advisor.
- Checks soil pH and salinity
- Checks water pH and salinity
- Checks correct fertilizer concentration
- Checks boiler water conductivity
- Automatic temperature compensation means no thermometers or adjustments
- Only small amount of soil needed for tests
- Tests conductivity/salinity only
- Budget priced
||2-12 pH (AG6/PH only)
||±0.2 pH units
||±2% of full scale
||Automatic (to 25°C) for Conductivity samples between 50-160°F/10-71°C
|pH Electrodes (Built-in):
||KCI gel-filled; field replaceable
|Conductivity Electrodes (Built-in):
||Never need replatinizing or replacement
||Easy finger adjustment of pH Zero and Gain (slope), and Conductivity
||Solid State sealed against moisture
||One 9-volt battery supplied
||Approximately one year or 2,000 tests
||Heavy gauge textured ABS
||Chip/crack resistant polyethylene
||3.4 W x 4.5 D x 4.0 H in./86 x 114 x 102 mm
||Less than 1 lb./0,45 kg
- Fertilizer Solutions
- Soil Analysis
- Water Analysis
AGRI-METERS™ Accessories, Replacement items and Solutions:
- Conductivity Standard Solution: Every AGRI-METER is factory calibrated with a Standard Solution of known
Conductivity value (3.9 millimhos/3900 micromhos). Your instrument will be kept most accurate by periodic
recalibration with the same type 442-3000 Standard Solution.
- pH Buffer Solutions: Available in 4, 7, and 10 pH values; they assure an accuracy of ±0.2 pH units on every
test. pH 7 Buffer is especially important, and should be used every two weeks. All Myron L® pH buffers are
traceable to N.I.S.T. certified pH references, and color coded for instant identification.
- Replacement pH Sensor: Model RPY is a unique non-refillable KCI gel-filled pH combination electrode,
featuring a porous liquid junction. Complete installation instructions included.
Click to order Standard
Solutions and Buffers
Myron L AGRI-METERS, excluding pH sensor, have a Two (2) Year Limited Warranty. The
pH sensor in Model AG6/PH has a Six (6) Month Limited Warranty. If the instrument fails to function normally,
return it to the factory prepaid. If, in the opinion of the factory, failure was due to materials or
workmanship, repair or replacement will be made without charge. A reasonable service charge will be made for
diagnosis for repairs due to normal wear, abuse or tampering. Warranty is limited to the repair or replacement
of the Myron L AGRI-METER only. The Myron L® Company assumes no other responsibility or liability.
DS and pDS Accessories Notes (Below):
* Approximate dimensions: 8.5 L x 5.4 W x 4.5 D in./ 216 L x 137 W x 114 D mm
** Approximate dimensions: 13.6 L x 10 W x 5.4 D in./ 346 L x 254 W x 137 D mm
- Models: AG-5, AG6/PH, PTP, RPY, RE-10, MC & MCATF