
Secchi Disk
20 cm diameter | Black & White quadrants | Calibrated line to 20 m | Marked at 0.5 m & 1 m intervals | Weighted parallel-sinking disk
ERE Inc. carries water quality instrumentation for field and laboratory analysis. Our selection includes multiparameter meters, pH meters, conductivity meters, dissolved oxygen meters, and turbidity meters from YSI, Hanna Instruments, and other leading brands. Ideal for enviro...

20 cm diameter | Black & White quadrants | Calibrated line to 20 m | Marked at 0.5 m & 1 m intervals | Weighted parallel-sinking disk

pH Range: 0.00 to 14.00 pH | EC Range: 0.00 to 10.00 mS/cm | Temperature Range: 0.0 to 60.0°C / 32.0 to 140.0°F | pH Resolution: 0.01 pH

pH 0–14 ±0.02 | DO 0–500% sat ±1.5% | EC 0–200 mS/cm ±1% | Turbidity 0–1000 FNU ±2% | IP67 meter / IP68 probe | 44,000-sample logger | Up to 140 h battery

pH -2.000 to 16.000 | EC 0.00–500 mS/cm | DO 0.00–45.00 mg/L | 202×140×12.7 mm, 250 g | Data logging 1,000 records, 8-hr battery

500 mL bottle | 5-year shelf life (unopened) | Application-specific formulas (cosmetic, food, dairy, agriculture, industrial) | Airtight tamper-proof bottle | Lot number and expiration date marked

500 mL per bottle | 5-year shelf life (unopened) | Formulations: General Purpose, Proteins, Inorganic Substances, Oil & Fats | FDA-compliant bottle variants available | Airtight tamper-proof seal with lot number & expiration date

500 mL | pH & ORP electrode storage | Reagent-grade KCl formulation | 5-year shelf life (unopened) | FDA-compliant bottle available (HI80300L)

AMCO-AEPA-1 standard | 30 mL bottle | NIST traceable | Non-toxic polymer bead suspension | Ranges: 0/20 NTU (HI93102) & 0/10/500 FTU (HI93703)

84 / 1413 / 12880 µS/cm | NIST-traceable KCl | ISO 3696/BS3978 | 5-year shelf life (unopened) | 500 mL bottle or 20 mL sachets

500 mL bottles | ORP values: 200/275 mV, 240 mV, 470 mV @ 25°C | Acceptance range ±10–20 mV | Reagent grade chemicals | 5-year shelf life (unopened)

O2 Range: 0.00 to 45.00 mg/L | % Saturation O2 Range: 0.0 to 300.0% | Temperature Range: 0.0 to 50.0°C | O2 Resolution: 0.01 mg/L

Range: 0.00 to 9.99; 10.0 to 99.9 & 100 to 1000 NTU | Range Selection: Automatic | Accuracy : ±2% of reading plus 0.02 NTU | Measuring Mode: Normal, Average, Continuous

Range: 0.00 to 2.50 mg/L (5.00 mg/L) | 100/Box

6 SKUs (0072–0077-SC) | Ranges: 5–150 / 50–1,500 / 500–15,000 mg/L COD | Mercury & mercury-free options | 25 vials/pack, 16 mm optical-quality | Digest 150°C ±2°C up to 2 hrs | EPA-approved method (mercury variants)

30–200°C range | 12 × 16 mm vials | ±0.1°C stability at 100°C | Timer 0–999 min | CE certified | 310 × 250 × 80 mm, 3.6 kg

pH Range: 0.00 to 14.00 pH | EC Range: 0 to 3999 μS/cm | TDS Range: 0 to 2000 ppm (mg/L) | Temperature Range: 0.0 to 60.0°C (32.0 to 140.0°F)

DO: 0–200.0% sat / 0–20.00 ppm (mg/L) | Temp: 0–50°C | Accuracy: ±2% FS (DO), ±1°C (temp) | IP67 waterproof | Altitude comp: 0–20,000 ft | Salinity comp: 0–50 ppt

0–9.99 ppm Total Chlorine | ±10% reading accuracy (0.5–5 ppm) | 0.01 ppm resolution | 15-reading memory | 0–50°C operating range

EC Range: 0 to 3999 µS/cm | TDS Range: 0 to 2000 ppm | Temperature Range: 0.0 to 60.0°C / 32.0 to 140.0°F | EC Resolution: 1 µS/cm

ORP Range: ± 1000 mV | Temperature Range: -5.0 to 60.0°C / 23.0 to 140.0°F | ORP Resolution: 1 mV | Temperature Resolution: 0.1°C / 0.1°F

pH Range: : -2.0 to 16.0 pH | Temperature Range : -5.0 to 60.0°C / 23.0 to 140.0°F | pH Resolution : 0.1 pH | Temperature Resolution : 0.1°C / 0.1°F

pH Range: -2.00 to 16.00 pH; -2.0 to 16.0 pH | pH Resolution: 0.01 pH; 0.1 pH | pH Accuracy: ±0.02 pH; ±0.1 pH | mV Range: ±825 mV (pH‐mV)