Stop Guessing Your Chlorine LevelsāGet 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 trustāevery single time.
Why Pool & Spa Professionals Choose the HI701:
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Lab-Grade Accuracy: Ā±0.03 ppm precision means you'll dose chemicals correctly the first timeāno more wasted chlorine or unsafe water
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Instant Digital Readout: No more squinting at color charts or second-guessing resultsāclear numerical display eliminates human error
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One-Button Simplicity: Get professional results in under 60 seconds, even if you've never used a colorimeter before
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Pocket-Sized Convenience: Weighs just 2.3 ozātake it poolside, to job sites, or keep it in your maintenance kit
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USEPA-Approved Method: DPD method (USEPA 330.5) trusted by water quality professionals worldwide
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Complete Testing Kit: Includes 2 sample cuvettes, reagents for 6 tests, battery, and quick-start guideāready to use out of the box
Perfect For:
ā Pool & spa maintenance professionals
ā Aquatic facility managers
ā Drinking water quality monitoring
ā RO system operators (pre-membrane chlorine removal)
ā Food & beverage processing (vegetable rinse water)
ā Environmental testing & education
š Subscribe & Save on Reagents - Never Run Out Again:
Set up automatic reagent deliveries and save 10-15%:
- š¦ Monthly Plan: Perfect for daily testers (pools, spas, labs) - Get 100-test packs delivered every 30 days
- š¦ Quarterly Plan: Ideal for weekly testers - Receive reagents every 90 days
- š¦ Seasonal Plan: Great for seasonal pool owners - Pre-schedule deliveries for pool opening/maintenance
š° Subscription customers save an average of $47/year on reagents plus get priority support and exclusive testing tips.
š Set Up Your Reagent Subscription Here
š” Smart Bundle Recommendations - Save Time & Money:
šÆ Most Popular: Add the HI93701-01 Reagent Pack (100 Tests) and save on per-test costs. Professional users test 2-3x dailyāstock up now and never run out mid-season.
š¬ Complete Water Testing Kit: Pair with a pH Meter for comprehensive pool/spa monitoring. Chlorine + pH testing = optimal water balance and chemical efficiency.
š”ļø Protect Your Investment: Add Replacement Glass Cuvettes (2-pack) and Microfiber Cleaning Cloths (4-pack) to maintain accuracy and extend instrument life.
š Free Resources for HI701 Owners:
When you purchase, you'll get exclusive access to:
- ā Water Testing Best Practices Guide - Learn optimal testing schedules and troubleshooting tips
- ā Chlorine Level Reference Chart - Quick-reference guide for ideal levels by application
- ā Maintenance & Calibration Video Tutorials - Extend your instrument's accuracy and lifespan
- ā Email Support from Water Quality Experts - Get answers to your testing questions
š§ Resources will be emailed within 24 hours of purchase. Check your inbox!
š Join Our Water Testing Community:
Get ongoing value from your purchase:
- š§ Monthly Testing Tips Newsletter - Seasonal maintenance advice, troubleshooting guides, and product updates
- š Quarterly Webinars - Learn advanced testing techniques from Hanna-certified experts
- š¬ Customer Community Forum - Connect with other professionals, share insights, and get peer support
- š Loyalty Rewards Program - Earn points on reagent purchases toward future equipment upgrades
š§ Expand Your Testing Capabilities:
Once you experience the accuracy of the HI701, consider adding:
- š§Ŗ pH Testing: Digital pH Meters - Essential companion for complete water balance
- š§Ŗ Total Chlorine Testing: Measure both free and combined chlorine for comprehensive analysis
- š§Ŗ Multi-Parameter Testing: Upgrade to photometers for testing 10+ parameters with one device
- š§Ŗ Specialty Testing: Copper, iron, alkalinity, hardness meters for advanced water management
š” 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 levelsāprotecting your investment and your customers' safety.
Technical Specifications:
| Model |
HI701 CheckerĀ®HC |
| Range |
0.00 to 2.50 ppm (mg/L) |
| Resolution |
0.01 ppm |
| Accuracy |
Ā±0.03 ppm Ā±3% of reading @ 25Ā°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 |
0-50Ā°C (32-122Ā°F), RH max 95% |
| Warranty |
1 Year Manufacturer Warranty |
What's Included:
š¦ HI701 CheckerĀ®HC Digital Colorimeter
š¦ 2 Sample Cuvettes with Caps
š¦ Free Chlorine Reagent Starter Kit (6 tests)
š¦ AAA Battery
š¦ Instruction Manual & Quick Start Guide
š¦ Access to Exclusive Owner Resources (emailed within 24 hours)
ā ļø Don't Forget Reagents - The Starter Kit Only Includes 6 Tests:
Most customers need additional reagents within the first week. We recommend:
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Occasional Users (1-2 tests/week): Order 25-test packs as needed
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Regular Users (daily testing): HI93701-01 (100 tests) - Best value at lower per-test cost
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Professional/Commercial: Subscribe & Save - Automatic deliveries + 10-15% discount
Replacement Reagents & Accessories:
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HI93701-01: Reagent refill pack (100 tests) - BEST VALUE | Subscribe & Save Available
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HI701-25: Reagent refill pack (25 tests)
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HI701-11: Calibration check standard - Recommended every 6 months
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Replacement Cuvettes: Glass cuvettes with caps (2-pack)
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Cleaning Cloths: Microfiber cloths for cuvette maintenance (4-pack)
How to Use (Simple 3-Step Process):
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Fill: Add water sample to cuvette up to the line (10 mL)
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Add Reagent: Tear open reagent packet and add to sample, cap and shake
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Read: Insert cuvette into HI701, press button, and read precise chlorine level on digital display
š Frequently Bought Together:
Customers who bought the HI701 also added:
š Ongoing Support & Service:
Your purchase includes lifetime support:
- ā Email support from certified water testing experts
- ā Phone support during business hours (EST)
- ā Video troubleshooting and calibration assistance
- ā Warranty service and repair coordination
- ā Trade-in program for equipment upgrades (contact us for details)
š Fast Shipping: In-stock items ship same/next business day
ā Trusted Brand: Hanna Instrumentsā50+ years of water testing innovation
šÆ Quality Guarantee: Factory-calibrated and quality tested before shipping
š 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.
