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Portable pH/EC/TDS meter, range: pH 0.0 to 14.0 pH EC 0.00 to 4.00 mS/cm TDS 0 to 1999 ppm (mg/L) - HI9813-51

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SKU: HI9813-51 Categories , Tag


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The HI9813-5 is an economical, water resistant, portable meter that measures pH, conductivity (EC), total dissolved solids (TDS) and temperature with a single probe. The meter operation is simplified with dedicated buttons for measurement modes to be displayed on the LCD and knobs for single point calibration of pH and EC/TDS.

The HI9813-5 has a variable EC to TDS conversion factor that automatically changes from 0.56 to 0.78 ppm = 1 µS/cm based on the actual EC reading. All readings are automatically temperature compensated using a temperature correction coefficient (β) fixed at 2%/oC. The HI9813-5 is suitable for agricultural, greenhouse and hydroponic applications.

3 in 1 probe with pH, EC/TDS and temperature sensors

Amplified pH electrode for immunity to electrical noise including from ballasts and pumps

Large LCD with tutorial instructions

Pre-order, Ships within 8-9 Weeks​


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The HI9813-5 portable meter features a large LCD which displays either pH, EC, TDS or temperature readings along with tutorial instructions. The pH readings are displayed with a 0.1 resolution and an accuracy of ±0.1 pH while the EC and TDS readings are displayed with a 0.01 mS/cm and 1 ppm (mg/L) resolution and 2% full-scale accuracy. The EC range of the HI9813-5 is from 0.00 to 4.00 mS/cm and TDS is from 0 to 1999 ppm. The temperature correction coefficient (β) is fixed at 2 %/oC and allows for automatic temperature compensated measurements of EC and TDS. The HI9813-5 is a basic pH/EC/TDS meter that is calibrated manually to a single point with the use of two trimmers. pH is calibrated to pH 7.01 while EC/TDS is calibrated to either 1.41 mS/cm (1413 µS/cm) or 1500 ppm. The LCD screen has battery life indicator as well as on-screen tutorial messages. The supplied HI1285-5 probe is a polypropylene body, amplified pH electrode with a built-in EC/TDS and temperature sensors. The amplifier for the pH electrode prevents interference from humidity and electrical noise from common sources including from motors, ballasts or pumps. The HI9813-5 is a versatile meter for the agricultural, greenhouse and hydroponic uses.

hi1285-5 electrode

HI1285-5 polypropylene body amplified pH electrode with built-in EC/TDS and temperature sensors

The HI9813-5 is supplied with a polypropylene body pH/EC/TDS/temperature probe. The pH, EC, TDS, and temperature sensor are housed in a single body that connects to the meter with a DIN connector.

Amplified pH electrode

The pH electrode circuit has a built-in amplifier that will reduce the effects of electrical noise on the high impedance pH measurement. Examples of sources of electrical noise include motors, ballasts, and pumps which are common in greenhouses.

Amperometric EC/TDS sensor

The EC/TDS readings are performed by an amperometric sensor. An alternating voltage is applied to the sensor and the amount of current that passes between the two stainless steel pins is dependent upon the amount of salts (fertilizer) present. A greater amount of salt present results in an increase in conductance.

Polypropylene body

The polypropylene body houses all the sensors in a single body design and is durable. The probe is gel filled for maintenance free operation. It does not have to be refilled periodically.

  • 3 sensors in a single probe
  • Pre-amplified pH electrode for resistance to electrical noise
  • Gel filled maintenance free pH electrode

Features at-a-glance

Water Resistant

Automatic Temperature Compensation

  • All readings are compensated for variations in temperature

EC to TDS conversion factor

  • Factor automatically adjusts from 0.56 to 0.78 based on actual EC readings
  • Factor based on 442 curve for natural water

Low Battery Indicator

SKU HI9813-5
Name Portable pH/EC/TDS Meter – HI9813-5
pH Range 0.0 to 14.0 pH
pH Resolution 0.1 pH
pH Accuracy ±0.1 pH
pH Calibration manual, 1-point through offset trimmer
EC Range 0.00 to 4.00 mS/cm
EC Resolution 0.01 mS/cm
EC Accuracy ±2% F.S.
EC Calibration manual, 1-point through slope trimmer
TDS Range 0 to 1999 ppm (mg/L)
TDS Resolution 1 ppm (mg/L)
TDS Accuracy ±2% F.S.
TDS Calibration manual, 1-point through slope trimmer
EC/TDS Temperature Compensation automatic from 0 to 50°C (32 to 122°F)
Temperature Correction Coefficient β=2%/°C typical
EC to TDS Conversion Factor variable based on reading from 0.56 to 0.72 according to the TDS 442 curve for natural water
Multi-parameter Probe HI 1285-5 combination, amplified pH/EC/TDS/temperature probe with built-in temperature sensor, 8-pin DIN connector and 1 m (3.3 in.) cable
Battery Type/Life 9V / approximately 150 hours of continuous use
Environment 0 to 50°C (32 to 122°F); RH max 100%
Dimensions 145 x 80 x 36 mm (5.7 x 3.1 x 1.4”)
Weight 230 g (8.1 oz)

HI9813-5 is supplied with HI 1285-5 pH/EC/TDS/°C probe, HI 70007 pH 7.01 sachet (1), HI 70031 1413 µS/cm (1.413 mS/cm) sachet (1), HI 70442 1500 ppm sachet (1), HI 700661 cleaning solution sachet (2), 9V alkaline battery (1) and instruction manual.

Portable pH/EC/TDS Meter – HI9813-5


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