Do-66 Intelligent Pen Type Dissolved Oxygen Analyzer - 207x32x36mm | Automatic Temperature Compensation, Lightweight At 85g, Multiple Color Options

Portable KL-025 Mini-Series pH Monitor - 0.00-14.00 pH Range, 75g Lightweight Design, DC 6V Power Supply, Easy Maintenance for Aquaculture Applications

Waterproof Conductivity And Temperature Meter - Digital Display, Replaceable Electrode | Easy To Carry, Various Sizes And Colors, 98 Grams

PH Temperature ORP Monitor - High Precision Dual Screen Measurement | Wall Mount Design, Easy Installation, BNC Composite Electrode

KL-033 Waterproof Portable Pen Type pH Meter - 0.00~14.00PH Range, 0.01PH Resolution, 98g Floating Design

KL-981 Portable Digital Pen-Type pH Meter - 69g, IP55 Splash Proof | Rugged Glass Sensor, One-Touch Calibration, Backlit LCD, Hold Function

Kl-096 Waterproof Portable Digital Ph Meter - Machine Weight: 200 Gram (G)

KL-03(II) Series Waterproof Portable Pen Type pH Meter - 70g, Lightweight Floatable, Automatic Temperature Compensation, Self-Calibrating Replaceable Probe

Kl-03(I) Portable Digital Pen Type Ph Meter - Machine Weight: 46 Gram (G)

PH-260 Portable Digital PH And TDS Meter - Triple LCD, BNC Composite Electrode, Wall Mountable | Multi-Parameter, High Precision, Easy Operation

KL-009(II) Portable Digital Pen Type pH Meter - Plastic, Blue | Compact, Easy Operation, On-the-Spot Measurement