See how to access and use the embedded menu, do standard (4.0/7.0 Solution Calibration), and quick calibration (recommended).
I've had my Blue Lab Truncheon for over ten years now and an Amazon pH pen for 2. Getting back into gardening indoors and tinkering with rockwool, I needed more accuracy and reliability. The GroLine HI9814 is the flagship combo meter from Hanna instruments GroLine and more than fits the bill.
The only downside to this meter is the embedded menu. You have to hold the "Mode" button for way longer than you think to get into the setup menu. Once you do though, you can change the Shut off time(8,60 or none), switch between 500 and 700 PPM scales (500 recommended for US, check with your nutrient manufacturer on their scale or just commit to using EC from the get-go), adjust the "beep" etc.
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From the manufacturer:
Features:
pH electrode - Preamplified for resistance to electrical noise including that generated by pumps and ballast
EC/TDS sensor - amperometric two pole design
Temperature - NTC sensor for accurate temperature measurement and compensation
3 sensors in a single probe
Waterproof
Designed to withstand the humidity of a growing environment
Wide pH Range
pH range is from 0.00 to 14.00 pH
Selectable EC to TDS conversion factor
Choice of either a 0.5 or 0.7 conversion factor
0.5 (500 CF) conversion factor is for an EC reading of 1000 μS/cm = 500 ppm
0.7 (700 CF) conversion factor is for an EC reading of 1000 μS/cm = 700 ppm
Automatic Temperature Compensation
All readings are compensated for variations in temperature
Temperature displayed in C or F along with pH, EC or TDS reading
Stability indicator
The meter displays a clock tag that will disappear when the reading has achieved stability
HOLD button
Freezes reading on the display to allow recording of measurement
BEPS (Battery Error Prevention System)
Meter will automatically shut off if there is not enough power to get an accurate measurement
Battery % level at startup
Low Battery Indicator
When the level is below 5%, the battery symbol on the LCD blinks to indicate a low battery condition.
Auto-off
A selectable time before meter will automatically shut off to conserve battery life. Options are after 8 minutes, 60 minutes, or disabled.
Warranty: 2 years (probe 6 months)
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