Product Description
Stop Guessing Your Chlorine Levels—Get Lab-Accurate Results in Seconds
The Hanna HI701 Free Chlorine Checker delivers professional-grade accuracy without the guesswork of test strips or color-matching kits. Whether you're maintaining a crystal-clear pool, ensuring spa safety, or monitoring drinking water quality, this digital colorimeter gives you precise 0.00-2.50 ppm readings you can trust—every single time.
Why Pool & Spa Professionals Choose the HI701:
Lab-Grade Accuracy: ±0.03 ppm precision means you'll dose chemicals correctly the first time—no more wasted chlorine or unsafe water
Instant Digital Readout: No more squinting at color charts or second-guessing results—clear numerical display eliminates human error
One-Button Simplicity: Get professional results in under 60 seconds, even if you've never used a colorimeter before
Pocket-Sized Convenience: Weighs just 2.3 oz—take it poolside, to job sites, or keep it in your maintenance kit
USEPA-Approved Method: DPD method (USEPA 330.5) trusted by water quality professionals worldwide
Complete Testing Kit: Includes 2 sample cuvettes, reagents for 6 tests, battery, and quick-start guide—ready to use out of the box
Perfect For:
✓ Pool & spa maintenance professionals
✓ Aquatic facility managers
✓ Drinking water quality monitoring
✓ RO system operators (pre-membrane chlorine removal)
✓ Food & beverage processing (vegetable rinse water)
✓ Environmental testing & education
🔄 Subscribe & Save on Reagents - Never Run Out Again:
Set up automatic reagent deliveries and save 10-15%:
📦 Monthly Plan: Perfect for daily testers (pools, spas, labs) - Get 100-test packs delivered every 30 days
📦 Quarterly Plan: Ideal for weekly testers - Receive reagents every 90 days
📦 Seasonal Plan: Great for seasonal pool owners - Pre-schedule deliveries for pool opening/maintenance
💰 Subscription customers save an average of $47/year on reagents plus get priority support and exclusive testing tips.
👉 Set Up Your Reagent Subscription Here
💡 Smart Bundle Recommendations - Save Time & Money:
🎯 Most Popular: Add the HI93701-01 Reagent Pack (100 Tests) and save on per-test costs. Professional users test 2-3x daily—stock up now and never run out mid-season.
🔬 Complete Water Testing Kit: Pair with a pH Meter for comprehensive pool/spa monitoring. Chlorine + pH testing = optimal water balance and chemical efficiency.
🛡️ Protect Your Investment: Add Replacement Glass Cuvettes (2-pack) and Microfiber Cleaning Cloths (4-pack) to maintain accuracy and extend instrument life.
📚 Free Resources for HI701 Owners:
When you purchase, you'll get exclusive access to:
✓ Water Testing Best Practices Guide - Learn optimal testing schedules and troubleshooting tips
✓ Chlorine Level Reference Chart - Quick-reference guide for ideal levels by application
✓ Maintenance & Calibration Video Tutorials - Extend your instrument's accuracy and lifespan
✓ Email Support from Water Quality Experts - Get answers to your testing questions
📧 Resources will be emailed within 24 hours of purchase. Check your inbox!
🏆 Join Our Water Testing Community:
Get ongoing value from your purchase:
📧 Monthly Testing Tips Newsletter - Seasonal maintenance advice, troubleshooting guides, and product updates
🎓 Quarterly Webinars - Learn advanced testing techniques from Hanna-certified experts
💬 Customer Community Forum - Connect with other professionals, share insights, and get peer support
🎁 Loyalty Rewards Program - Earn points on reagent purchases toward future equipment upgrades
🔧 Expand Your Testing Capabilities:
Once you experience the accuracy of the HI701, consider adding:
🧪 pH Testing: Digital pH Meters - Essential companion for complete water balance
🧪 Total Chlorine Testing: Measure both free and combined chlorine for comprehensive analysis
🧪 Multi-Parameter Testing: Upgrade to photometers for testing 10+ parameters with one device
🧪 Specialty Testing: Copper, iron, alkalinity, hardness meters for advanced water management
💡 Pro Tip: Most professionals expand their testing suite within 6 months. Plan your water quality lab now and save with multi-meter bundles.
What's the Real Cost of Inaccurate Testing?
Test strips might seem cheaper, but inaccurate readings lead to over-chlorination (wasted chemicals, skin/eye irritation, equipment damage) or under-chlorination (algae growth, bacteria, health risks). The HI701 pays for itself by helping you maintain optimal chlorine levels—protecting your investment and your customers' safety.
Technical Specifications:
Model
HI701 Checker®HC
Range
0.00 to 2.50 ppm (mg/L)
Resolution
0.01 ppm
Accuracy
±0.03 ppm ±3% of reading @ 25°C
Method
DPD (USEPA 330.5 adaptation)
Light Source
LED @ 525 nm
Detector
Silicon photocell
Battery
1 x AAA (included)
Auto Shut-Off
2 minutes (extends battery life)
Dimensions
86 x 61 x 37.5 mm (3.4" x 2.4" x 1.5")
Weight
64 g (2.3 oz)
Operating Range
0-50°C (32-122°F), RH max 95%
Warranty
1 Year Manufacturer Warranty
What's Included:
📦 HI701 Checker®HC Digital Colorimeter
📦 2 Sample Cuvettes with Caps
📦 Free Chlorine Reagent Starter Kit (6 tests)
📦 AAA Battery
📦 Instruction Manual & Quick Start Guide
📦 Access to Exclusive Owner Resources (emailed within 24 hours)
⚠️ Don't Forget Reagents - The Starter Kit Only Includes 6 Tests:
Most customers need additional reagents within the first week. We recommend:
Occasional Users (1-2 tests/week): Order 25-test packs as needed
Regular Users (daily testing): HI93701-01 (100 tests) - Best value at lower per-test cost
Professional/Commercial: Subscribe & Save - Automatic deliveries + 10-15% discount
Replacement Reagents & Accessories:
HI93701-01: Reagent refill pack (100 tests) - BEST VALUE | Subscribe & Save Available
HI701-25: Reagent refill pack (25 tests)
HI701-11: Calibration check standard - Recommended every 6 months
Replacement Cuvettes: Glass cuvettes with caps (2-pack)
Cleaning Cloths: Microfiber cloths for cuvette maintenance (4-pack)
How to Use (Simple 3-Step Process):
Fill: Add water sample to cuvette up to the line (10 mL)
Add Reagent: Tear open reagent packet and add to sample, cap and shake
Read: Insert cuvette into HI701, press button, and read precise chlorine level on digital display
🎁 Frequently Bought Together:
Customers who bought the HI701 also added:
✓ HI93701-01 Free Chlorine Reagents (100 Tests) - 89% of customers add this
✓ pH Meter - Complete water quality monitoring
✓ Replacement Glass Cuvettes - Keep a backup set on hand
📞 Ongoing Support & Service:
Your purchase includes lifetime support:
✓ Email support from certified water testing experts
✓ Phone support during business hours (EST)
✓ Video troubleshooting and calibration assistance
✓ Warranty service and repair coordination
✓ Trade-in program for equipment upgrades (contact us for details)
🚚 Fast Shipping: In-stock items ship same/next business day
✓ Trusted Brand: Hanna Instruments—50+ years of water testing innovation
💯 Quality Guarantee: Factory-calibrated and quality tested before shipping
🔄 Easy Returns: 30-day satisfaction guarantee
Note: For freshwater samples only. Reagents sold separately after starter kit is used. Regular calibration checks recommended every 6 months for continued accuracy.
