Temperature Compensation pH: automatic; EC/TDS: automatic with ß adjustable from 0.0 to 2.4% / °C
Calibration pH automatic, 1 or 2 points with 2 sets of memorized buffers
(pH 4.01 / 7.01 / 10.01 or 4.01 / 6.86 / 9.18)
Calibration EC/TDS automatic, 1 point
TDS Conversion Factor adjustable from 0.45 to 1.00
pH Electrode HI 73127 (replaceable; included)
Environment 0 to 50°C (32 to 122°F); RH max 100%
Battery Type / Life 4 x 1.5V / approx. 100 hours of continuous use;
auto-off after 8 minutes of non-use
Dimensions 163 x 40 x 26 mm (6.4 x 1.6 x 1.0")
Weight 100 g (3.5 oz.)
Hanna 690 HI98129 Combination PH TEMP TDS Meter
for Coffee Roasters
PRICING AVAILABLE BELOW ON WEBSTORE LINK
The HI 98129 Combo waterproof tester offer high accuracy pH, EC/TDS and temperature measurements in a single tester! No more switching between meters for your routine measurements. The waterproof Combo (it even floats) has a large easy-to-read, dual-level LCD and automatic shut-off. pH and EC/TDS readings are automatically compensated for the effects of temperature (ATC). This technologically advanced tester has a replaceable pH electrode cartridge with an extendable cloth junction as well as an EC/TDS graphite electrode that resists contamination by salts and other substances. This gives these meters a greatly extended life. Your tester no longer needs to be thrown away when the pH sensor is exhausted.
The EC/TDS conversion factor is user selectable as is the temperature compensation coefficient (ß). Fast, efficient, accurate and portable, the Combo pH, EC/TDS and temperature tester brings you all the features you've asked for and more!
A measure of the total dissolved solids, or extractable solids gives an indication of proper grinder calibration. TDS Meters are sometimes checked against results obtained by a laboratory moisture balance, which utilizes loss on drying, or gravimetrics, to determine percent solids. Certified calibration solutions are available otherwise.
When using LOD techniques it is preferable to use low temperatures over longer periods of time, to prevent organic volatiles from being burned off and creating inaccurate data.
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