Accurate measurement from only a single drop of sample onto HORIBA’s original flat sensor. 

If you need discussion about this product, please click “Find Solution”. Or click the “Order Now” to buy now.

Accurate measurement from only a single drop of sample onto HORIBA’s original flat sensor. LAQUAtwin product line-up offers easy, quick, and reliable measurement of 8 parameters. It brings new dimension to your water quality testing. 


The only pocket meter that directly measures pH in 0.1ml sample (or 0.05ml sample with sampling sheet B). Unique sensor allows measurement of viscous liquids, solids, and even powder samples. No need for a beaker to calibrate your meter or measure a sample. Just place few drops of the standard or sample onto the flat sensor. This procedure saves you time and prevents wasting your precious sample.

  • Minimum sample volume: 0.1ml (0.05ml with sampling sheet B)
  • Up to 2 calibration points
  • pH and mV display
  • Auto calibration
  • Auto buffer recognition: USA & NIST pH buffers
  • Auto temperature compensation
  • Auto stable / auto hold measurement
  • Auto power off: 30 mins
  • Low battery indicator
  • IP67 Rating dust & waterproof
  • Replaceable sensor
  • 400 Hours battery life: continuous use without backlight
  • Material: ABS epoxy 
  • Display: custom (monochrome) LCD with backlight
  • Operating conditions: 5 to 40°C, 85% or less relative humidity
  • Warranty: 2 years – meter; 6 months – sensor
  • Packed in handy carrying case
  • Supplied with pH 4.01 & 7.00 buffers (14ml each), 5 x sampling sheets B, 2 x CR2032 batteries, dropper, instruction and quick manuals
Measurement PrincipleGlass Electrode
Minimum Sample Volume0.1ml (0.05ml with Sampling Sheet B)
pH Range & Resolution0.0 to 14.0 pH : 0.1 pH
mV Range & Resolution± 650 mV : 1mV
Accuracy±0.1 pH
DisplayCustom (monochrome) digital LCD with backlight
Operating Temperature5 to 40°C
Operating Humidity85% or less relative humidity (no condensation)
PowerCR2032 batteries (2)
Battery LifeApprox. 400 hours in continuous use (without backlight)
Dimensions164 × 29 × 20mm (excluding projections)
MassApprox. 55 g (including sensor and batteries)
FunctionsAuto Calibration
 Auto Buffer Recognition
 Auto Temperature Compensation
 Temperature Calibration (only for pH-33)
 Auto Stable / Auto Hold Measurement
 Auto Power Off (30mins)
 Switchable Backlight
 Low Battery Indicator
 IP67 Dust / Waterproof
 Replaceable Sensor
WhatsApp chat