The Horiba LAQUAtwin ORP-11 is the world’s first portable water quality meter that fits in your pocket while delivering laboratory-grade accuracy. Built for professionals in hydroponics, aquaponics, environmental testing, and agriculture, the ORP-11 measures Oxidation-Reduction Potential (ORP) and Eh values with unparalleled precision in the field.

This waterproof and dustproof meter combines a platinum disk ORP electrode, temperature sensor, and digital display in one ultra-compact unit. Requiring only 0.3 ml of sample (0.05 ml with a sampling sheet), the LAQUAtwin allows for rapid spot testing directly from your nutrient solution, aquarium, pond, or any other water source.

Whether you're monitoring disinfection levels, nutrient uptake, or redox balance, the ORP-11 ensures accuracy within ±2 mV, helping you fine-tune your growing or testing conditions with confidence.

Ideal for growers, technicians, or researchers who need portable, fast, and accurate redox readings—right at their fingertips.

Features

First-Ever Pocket ORP & Eh Meter: Compact and portable design, perfect for field use or mobile hydroponics labs.
High Accuracy: Achieves ±2 mV accuracy across a wide measurement range of -1000 mV to +1000 mV.
Low Sample Volume: Requires only 0.3 ml (or 0.05 ml with sampling sheet) of liquid for quick readings.
Auto & Custom Calibration: Recognises standard 225 mV calibration solution and allows for manual entry.
Advanced Modes: Auto hold, auto stable, temperature compensation, and temperature calibration.
Digital Backlit Display: Clear LCD with visual indicators and smiley face for stable readings.
Replaceable Sensor: Easy maintenance with platinum disk polishing and user-replaceable electrode.
IP67 Waterproof Rating: Fully water- and dust-resistant, ideal for rugged environments.
Long Battery Life: Up to 400 hours of continuous use from 2 CR2032 batteries.
Complete Kit Included: Comes with standard solution, sampling sheets, dropper, cleaning swab, and storage case.

Specifications

Model: ORP-11
Measurement Principle: ORP Electrode
Measurement Range: -1000 to +1000 mV
Resolution: 1 mV
Accuracy: ±2 mV
Minimum Sample Volume: 0.3 ml (0.05 ml with sheet)
Temperature Display: 0 to 50.0°C
Display Type: Monochrome LCD with Backlight
Waterproof Rating: IP67
Power Supply: 2×CR2032 Batteries (Included)
Battery Life: Up to 400 hrs
Body Material: ABS Epoxy
Sensor Type: Replaceable Platinum Disk
Dimensions: 164 x 29 x 20 mm
Weight: Approx. 55g

What's in the box

ORP-11 Pocket Meter
225 mV ORP Standard Solution (14 ml)
Abrasive Cotton Swab
5 × Sampling Sheets
Dropper
2 × CR2032 Batteries
Instruction Manual
Quick Start Guide
Protective Storage Case

Model

ORP-11

Measurement Range

-1000 to +1000 mV

Resolution

1 mV

Accuracy

±2 mV

Sample Volume

0.3 ml (0.05 ml with sheet)

Temperature Range

0 to 50.0°C

Calibration Points

1 (Auto or Custom)

Display

Monochrome Digital LCD (Backlit)

Sensor

Platinum Disk (Replaceable)

IP Rating

IP67 Waterproof & Dustproof

Power

2×CR2032 Batteries

Battery Life

Approx. 400 hrs

Dimensions

164 x 29 x 20 mm

Weight

Approx. 55g