{"product_id":"milwaukee-cd97-low-range-tds-pen-tester-0-999-ppm-atc","title":"Milwaukee CD97 Low Range TDS Pen Tester | 0–999 ppm | ATC | Water Conditioning, RO \u0026 Education","description":"\u003ch2\u003eMilwaukee CD97 Low Range TDS Pen – Digital PPM Tester with ATC\u003c\/h2\u003e\n\u003cp\u003eMonitor water purity with confidence using the \u003cstrong\u003eMilwaukee CD97\u003c\/strong\u003e — a compact, digital \u003cstrong\u003eTotal Dissolved Solids (TDS) pen tester\u003c\/strong\u003e engineered for water conditioning, reverse osmosis (RO) system verification, hydroponics, aquarium maintenance, drinking water testing, and science education. Simple, accurate, and built to last, the CD97 delivers reliable ppm readings with \u003cstrong\u003eAutomatic Temperature Compensation (ATC)\u003c\/strong\u003e in a pocket-sized form factor.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow Range TDS Measurement (0–999 ppm)\u003c\/strong\u003e — Ideal for water conditioning, RO filter verification, and drinking water quality monitoring\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic Temperature Compensation (ATC)\u003c\/strong\u003e — Corrects readings automatically from 5–50°C (41–122°F) for accurate results regardless of sample temperature\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFactory Calibrated\u003c\/strong\u003e — Ready to use out of the box; manual 1-point recalibration available via trimmer when needed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e±10 ppm Accuracy\u003c\/strong\u003e — Precise enough for water conditioning targets, filter change decisions, and educational demonstrations\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300-Hour Battery Life\u003c\/strong\u003e — 4 × 1.5V alkaline batteries included; long runtime minimizes downtime\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eppm to µS\/cm Convertible\u003c\/strong\u003e — Readings easily converted to EC using 0.5 (500 scale), 0.7 (700 scale), or 442 scale factors\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact Pen Form Factor\u003c\/strong\u003e — Lightweight (3.5 oz) and pocket-sized for field, lab, or classroom use\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTDS Range:\u003c\/strong\u003e 0 – 999 ppm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResolution:\u003c\/strong\u003e 1 ppm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccuracy:\u003c\/strong\u003e ±10 ppm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Compensation:\u003c\/strong\u003e Automatic (ATC), 5–50°C (41–122°F), β = 2%\/°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalibration:\u003c\/strong\u003e Factory calibrated; manual 1-point via trimmer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCalibration Solution:\u003c\/strong\u003e M10080B — 800 ppm TDS sachets (25 × 20 mL)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery:\u003c\/strong\u003e 4 × 1.5V alkaline (included) | Battery Life: ~300 hours continuous\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Environment:\u003c\/strong\u003e 0–50°C (32–122°F); max RH 100%\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 6.0 × 1.2 × 0.95 in (180 × 65 × 32 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 3.5 oz (99 g)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e CD97 | Barcode: 810666001680\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Romania\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTDS to EC Conversion Guide\u003c\/h2\u003e\n\u003cp\u003eTDS (ppm) readings can be converted to electrical conductivity (µS\/cm) using the following common scale factors:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.5 Factor (500 Scale):\u003c\/strong\u003e 1 ppm = 2.0 µS\/cm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.7 Factor (700 Scale):\u003c\/strong\u003e 1 ppm ≈ 1.43 µS\/cm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e442 Scale:\u003c\/strong\u003e 1 ppm ≈ 1.43 µS\/cm\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eReverse osmosis (RO) system filter verification\u003c\/li\u003e\n\u003cli\u003eDrinking water \u0026amp; tap water quality monitoring\u003c\/li\u003e\n\u003cli\u003eWater conditioning \u0026amp; softener performance testing\u003c\/li\u003e\n\u003cli\u003eHydroponics nutrient solution monitoring\u003c\/li\u003e\n\u003cli\u003eAquarium \u0026amp; reef tank water quality\u003c\/li\u003e\n\u003cli\u003eScience education \u0026amp; classroom labs\u003c\/li\u003e\n\u003cli\u003ePool \u0026amp; spa water testing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eProbe Care \u0026amp; Maintenance\u003c\/h2\u003e\n\u003cp\u003eEC\/TDS electrodes can develop mineral and nutrient buildup over time. To maintain accuracy and extend probe life:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAlways rinse the probe in fresh tap or deionized (DI) water after every use\u003c\/li\u003e\n\u003cli\u003eRecalibrate periodically using M10080B 800 ppm calibration solution sachets\u003c\/li\u003e\n\u003cli\u003eStore the pen with the protective cap on to prevent probe damage\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Milwaukee Instruments?\u003c\/h2\u003e\n\u003cp\u003eMilwaukee Instruments is trusted worldwide by water treatment professionals, hydroponics growers, aquaculture specialists, and educators. The CD97 combines Milwaukee’s proven build quality, factory-calibrated accuracy, and long battery life in one of the most cost-effective TDS pen testers on the market.\u003c\/p\u003e","brand":"MILWAUKEE INSTRUMENTS","offers":[{"title":"Default Title","offer_id":40489778053207,"sku":"CD97","price":34.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1555\/0581\/files\/CD97.jpg?v=1736818579","url":"https:\/\/getultimatenow.com\/products\/milwaukee-cd97-low-range-tds-pen-tester-0-999-ppm-atc","provider":"Get Ultimate Now ","version":"1.0","type":"link"}