Portable single-parameter water quality detector  AMT-DO100

Definition: specifically measures onlyone water quality parameterhandheld / Portable instrument, divided intoElectrode type (pen-type / Handheld probe)andSpectrophotometric colorimetric type, simple structure, strong specificity, lower price than multi-parameter.

1. Two major types & Common models

1. Electrochemical electrode type (mainly pen-type, no reagents, measure by immersion)

Principle: electrode sensing, automatic temperature compensation

• pH meter: measures acidity and alkalinity, most common pen-type
• DO Dissolved oxygen meter: dissolved oxygen in water, aquaculture, rivers
• ORP ORP meter
• Conductivity / TDS Pen: measures total dissolved solids, mineralization
• Salinity meter ✅Advantages: After calibration, directly immerse in water to read, results in seconds; very small, pen-shaped; no consumables.⚠️Disadvantages: Electrodes age, require regular calibration and immersion storage; cannot measureCODchemical pollutants such as ammonia nitrogen.

2. Spectrophotometric colorimetric single-parameter detector (host + pre-packaged reagents)

Principle: water sample plus reagent develops color,LED measures absorbance to convert concentration Common:Single-parameter residual chlorine detector, ammonia nitrogen detector,COD detector, total phosphorus, turbidity, hexavalent chromiumetc. ✅Advantages: Good accuracy for a single parameter, suitable for on-site rapid screening; ⚠️Disadvantages:Must use dedicated reagents, reagents have a shelf life;COD and total phosphorus require on-site digestion for some models.

2. Core advantages and disadvantages

👍Advantages

1. Strong specificity, optimized for a single parameter, good stability
2. Lower price, simple maintenance; buy one for whichever parameter is needed
3. Small size, light weight, battery-powered, convenient for field and inspection carrying
4. Low operating threshold, suitable for long-term fixed monitoring of a single parameter

👎Disadvantages

1. Can only measureone parameterIf multiple parameters need to be measured, multiple instruments must be purchased
2. Electrode type: Electrodes are consumables, lifespan generally 1~3 years, requires regular calibration
3. Spectrophotometric type: continuously consumes pre-packaged reagents, long-term use has consumable costs

3. Typical application scenarios

• Swimming pool / Secondary water supply:Single-parameter residual chlorine meter
• Aquaculture:Dissolved oxygen meter,pH Pen
• Pure water / RO water outlet:TDS Pen
• River patrol only measures turbidity:Portable turbidity meter
• On-site wastewater screening only for ammonia nitrogen / COD: single-parameter spectrophotometric detector