KWQ-8699 pH / EC / TDS / Salinity / S.G. / Temp. (6-in-1 Pen Meter) IP65 KEPLER

6-in-1 Water Quality Pen Meter KEPLER KWQ-8699

KEPLER KWQ-8699 6-in-1 Pen Meter is a digital pen-style water quality meter for measuring pH, electrical conductivity (EC), total dissolved solids (TDS), salinity, specific gravity (S.G.), and temperature, all 6 parameters in one device. It is suitable for water quality testing in aquaculture, hydroponic systems, seawater testing, and general water testing.

The device supports pH measurement in the range of 0.00-14.00 pH with a resolution of 0.01 pH and accuracy of ±0.01 pH. It also features an automatic range (Auto Range) EC measurement system, covering a range from 0 µS/cm to 200.0 mS/cm, allowing for measurement of both low conductivity water and high concentration solutions according to the device's specifications.

KWQ-8699 has a TDS Factor adjustment function from 0.40-1.00, supporting application in hydroponic systems and nutrient solutions. It can measure salinity from 0.00-159.9 ppt and display specific gravity in the range of 0.960-1.080 for solutions according to the device's calculation conditions.

The device uses an LCD screen with a backlight, has interchangeable pH and EC probes, supports up to 3-point pH calibration and up to 4-point EC/TDS/Salinity calibration. It has an IP65 protection rating and a rechargeable lithium battery via USB-C, making it suitable for field testing.

General Specifications

• Brand: KEPLER
• Product Model: KWQ-8699
• Product Type: 6-in-1 Water Quality Pen Meter
• Measures 6 water quality parameters: pH, EC, TDS, Salinity, Specific Gravity, and Temperature
• pH Measurement Range: 0.00-14.00 pH
• pH Resolution: 0.01 pH
• pH Accuracy: ±0.01 pH
• Supports Auto Range EC measurement up to 200.0 mS/cm
• EC Accuracy: ±2% F.S. ±1 digit
• Adjustable TDS Factor from 0.40-1.00
• Salinity Measurement Range: 0.00-159.9 ppt for NaCl measurement
• Specific Gravity Display Range: 0.960-1.080
• Temperature Measurement Range: 0.0-70.0°C
• Temperature Accuracy: ±0.6°C
• Supports Automatic Temperature Compensation (ATC) in the range of 0.0-50.0°C
• Supports up to 3-point pH calibration
• Supports calibration of EC/TDS/Salinity at up to 4 points
• Replaceable pH and EC sensors
• 30 x 18 mm LCD display with backlight
• IP65 protection rating
• Integrated rechargeable lithium battery
• Supports charging via USB-C 5V
• Suitable for aquaculture and hydroponic systems

Technical Specifications

Specifications	Details
Brand	KEPLER
Model	KWQ-8699
Product Type	6-in-1 Water Quality Pen Meter
Measurement Parameters	pH / EC / TDS / Salinity / S.G. / Temperature
pH Measuring Range	0.00-14.00 pH
pH Accuracy	±0.01 pH
pH Resolution	0.01 pH
EC Measuring Range 1	0-199.9 µS/cm
EC Measuring Range 2	200-1999 µS/cm
EC Measuring Range 3	2.00-19.99 mS/cm
EC Measuring Range 4	20.0-200.0 mS/cm
EC Range Selection	Automatic Range
EC Accuracy	±2% F.S. ±1 Digit
EC Resolution	0.1 µS/cm / 1 µS/cm / 0.01 mS/cm / 0.1 mS/cm
TDS Measuring Range 1	0-199.9 x f ppm
TDS Measuring Range 2	200-1999 x f ppm
TDS Measuring Range 3	2.00-19.99 x f ppt
TDS Measuring Range 4	20.0-200.0 x f ppt
TDS Factor (f)	Adjustable 0.40-1.00
TDS Accuracy	±2% F.S. ±1 Digit
TDS Resolution	0.1 / 1 ppm; 0.01 / 0.1 ppt
Salinity Measuring Range	0.00-11.40 ppt / 11.4-159.9 ppt (NaCl)
Salinity Accuracy	±2% F.S. ±1 Digit
Salinity Resolution	0.01 / 0.1 ppt
Specific Gravity Range	0.960-1.080 (NaCl)
Specific Gravity Resolution	0.001
Temperature Measuring Range	0.0-70.0°C / 32.0-158.0°F
Temperature Accuracy	±0.6°C / ±1°F
Temperature Resolution	0.1°C / 0.1°F
ATC Active Range	0.0-50.0°C
Temperature Coefficient	2.0% per °C
Normalization Temperature	25°C
pH Calibration	Up to 3 Points
EC / TDS / Salinity Calibration	Up to 4 Points
Sensor Design	Replaceable pH / EC Sensors
Display	LCD with Backlight
LCD Size	30 x 18 mm
Operating Temperature	0-50°C
Operating Humidity	<80% RH
Storage Temperature	0-60°C
Storage Humidity	<90% RH
Ingress Protection	IP65
Battery	Built-in Rechargeable Lithium Battery
Charging Interface	USB-C, 5V
Power Consumption	<6.5 mA (Backlight OFF) / <12 mA (Backlight ON)
Response Time	<90 Seconds
Dimensions (L x W x H)	210 x 39 x 39 mm
Weight	Approximately 120 g

Parameter Measurement Specifications

1. pH - Acidity-Alkalinity

Measures the acidity-alkalinity of water or solution in the range of 0.00-14.00 pH, with a resolution of 0.01 pH and accuracy of ±0.01 pH. Suitable for water quality inspection and solution condition control, supporting maximum calibration at 3 points.

2. Electrical Conductivity (EC) - Conductivity

Measures conductivity by utilizing the ability of ions in the solution to conduct electricity. It has an Auto Range system for automatic measurement range selection from 0-199.9 µS/cm, 200-1999 µS/cm, 2.00-19.99 mS/cm, and 20.0-200.0 mS/cm. Suitable for general water, nutrient solutions, and high-salinity water according to the measurement range of the device.

3. Total Dissolved Solids (TDS) - Dissolved Solids

TDS is calculated from conductivity using a TDS Factor, which can be adjusted from 0.40-1.00 to suit the type of solution and usage mode, such as hydroponic systems. TDS is an approximate value derived from EC, not a direct measurement of solution type.

4. Salinity - Salinity

Measures or displays salinity of the solution in the range of 0.00-159.9 ppt for NaCl reference. Suitable for use in checking salinity of water in aquaculture and systems with controlled salt concentration.

5. Specific Gravity (S.G.) - Specific Gravity

Supports specific gravity display in the range of 0.960-1.080 with a resolution of 0.001 for solutions according to the device's calculation method. This data helps in assessing water quality in aquaculture and salinity control. However, this value is not a direct measurement of density using an independent density sensor.

6. Temperature - Temperature

Measures water temperature in the range of 0.0-70.0°C, with a resolution of 0.1°C and accuracy of ±0.6°C. It supports automatic temperature compensation (ATC) within the range of 0.0-50.0°C, helping to reduce the effect of temperature on conductivity readings.

Multi-Point Calibration System

KEPLER KWQ-8699 supports multi-point calibration to adjust measurement accuracy. It is divided into maximum 3 points for pH calibration and maximum 4 points for EC/TDS/Salinity calibration according to the catalog data.

Appropriate pH buffer solutions and standard conductivity solutions should be selected according to the measurement range, and calibration should be performed according to the manufacturer's instructions.

Standard solutions used for calibration should be in a ready-to-use condition and free from contamination to prevent measurement errors.

Auto Range and Temperature Compensation System

The device can automatically select the EC measurement range, allowing measurement of solutions with different conductivity values without manually changing the range each time.

Automatic temperature compensation (ATC) supports the range of 0.0-50.0°C, with a Temperature Coefficient of 2.0% per °C according to the catalog data, and uses 25°C as the reference temperature for reporting conductivity values.

Temperature compensation is based on the device's model and does not fully compensate for actual changes in composition or concentration that occur in the solution.

Removable Sensor Heads

KWQ-8699 uses removable pH and EC sensor heads, with the EC sensor designed to be resistant to rust, and the pH sensor suitable for measurement according to the device's requirements.

When replacing the sensor head, compatible equipment for the KWQ-8699 model should be used, and recalibration should be performed according to the manufacturer's instructions before use.

Usage and Measurement Procedures

• Check the condition of the device, sensor head, and battery level before starting use.
• Check the type of sample and measurement range to ensure compatibility with the required parameters.
• Calibrate the device at the scheduled intervals using an appropriate standard solution.
• Wash the sensor head with the appropriate water as per the manual before switching to a new sample.
• Immerse the sensor head into the sample at the level and method specified by the manufacturer.
• Select or read the parameters pH, EC, TDS, Salinity, S.G., and Temperature according to the device's display.
• Wait for the measurement values to stabilize before reading and recording the results.
• Check the TDS Factor to match the usage mode when using estimated TDS values.
• After measurement, wash and store the sensor head according to the appropriate method for each type of sensor head.
• Maintain the pH sensor with electrode storage solution as recommended by the manufacturer.
• Cover the charging port and protective cap properly before using the device in a humid environment.

Examples and Usage Guidelines

• Measure water quality in aquaculture systems.
• Check pH, EC, and TDS values in hydroponic systems.
• Check salinity and specific gravity in seawater systems.
• Measure water quality in aquariums and aquatic animal rearing systems.

• Check the concentration of nutrient solutions in agricultural work
• Measure the quality of general water in field work
• Applicable for water inspection in industrial systems within the scope and suitability of the sensor
• Used for experimental work and water quality studies

Standard Package Items

• KEPLER KWQ-8699 Water Quality Meter with built-in battery
• User Manual (Instruction Manual)
• USB-C Charging Cable
• Hard Storage Case
• Wrist Strap

Optional Accessories

• Empty bottle for buffer solution, 20 mL
• 5-meter extension cable set

Considerations

• The device has an IP65 protection rating; do not submerge the entire unit in water
• The automatic temperature compensation (ATC) range is 0.0-50.0°C, which differs from the temperature measurement range of 0.0-70.0°C
• The TDS value is calculated from the EC value using the TDS Factor, so the conversion value must be selected appropriately for the solution
• The salinity and S.G. values are calculated based on the NaCl solution conditions of the device
• The measurement accuracy depends on calibration, sensor condition, and the properties of the sample
• Calibrate the device before use at a frequency appropriate for the work requirements
• Do not store the pH sensor dry or submerged in distilled water for long periods, unless the manufacturer specifies otherwise
• When using the device in seawater or high-salinity solutions, clean and maintain the sensor after use
• Optional accessories are not included in the standard set, unless specified in the quotation
• Check the delivered equipment list and warranty details with the seller before ordering