pH & TDS Continuous Indicator
HI 981404N-01 is ideal for agricultural, horticultural and hydroponics applications where pH and TDS levels need to be continuously monitored for optimal plant growth. This instrument continuously monitors and displays the values of a solution on an easy to read set of LCD’s.
The HI 1286 gel filled pH electrode is replaceable and the BNC connector is protected behind a waterproof sleeve. The unique design of the electrode guarantees greater clogging resistance in fertilizer solutions with high concentrations of phosphate, nitrate, etc. TDS measurements are performed using the 4-4-2 conversion factor of 0.7 so you do not need to convert the readings.
This model is equipped with a grounding bar to ensure highly accurate pH readings and longer electrode life.
The HI 981404N-01 is compact and easy to install and use making it ideal for all continuous monitoring applications.
Range pH 0.0 to 14.0 pH
TDS 0 to 1990 mg/L (ppm)
Resolution pH 0.1 pH
TDS 10 mg/L (ppm)
Accuracy @ 20°C pH ±0.2 pH
TDS ±2% F.S.
Calibration pH manual at one or two points
TDS manual at one point
Compensation automatic from 5 to 50°C (41 to 122°F) (TDS only)
TDS Conversion Factor 0.7 ppm = 1 µS/cm
Probes HI 1286 interchangeable pH electrode (included), HI 7634 TDS probe (fixed), HI 1283 grounding bar with 2 m (6.6’) cable (included)
Power Supply 12 VDC adapter (included)
Environment 0 to 50°C (32 to 122°F), RH 95%
Dimensions 165 x 110 x 35 mm (6.5 x 4.3 x 1.3”)
Weight 300 g (10.6 oz.)
HI 1286 Spare pH Electrode for pH Indicators
HI 70000P Rinsing Solution 25 x 20 mL sachets
HI 70004P 4.01 pH Buffer Solution, (25) 20 mL
HI 70007P 7.01 pH Buffer Solution
(25) 20 mL sachets
HI 70442P 1500 mg/L (ppm) TDS Solution, (25) 20 mL Sachets
HI 70039P 5000 µS/cm EC Solution (25) 20 mL Sachets
HI 70300M Electrode Storage Solution
1 x 230 mL bottle
HI 7061M General Purpose Cleaning Solution
1 x 230 mL bottle
HI 710005 Power Adapter, 115 Vac to 12 VDC, US Plug
HI 710006 Power Adapter, 230 Vac to 12 VDC, European Plug