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Hanna Instruments HI758 Marine Calcium Checker HC fit check

Quick answer

Hanna Instruments HI758 Marine Calcium Checker HC is a calcium checker from Hanna Instruments. Listed features: Handheld colorimeter for marine calcium; Range 200-600 ppm, resolution 1 ppm; LED light source at 610 nm, +/-6% accuracy. It earns its place when it watches a risk the build actually has, such as heater failure, salinity drift, or alkalinity swings.

Hanna Instruments HI758 Marine Calcium Checker HC: best for systems 5 gallons and up. Specs, compatibility math, sizing risks, and alternatives before you buy.

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Hanna Instruments HI758 Marine Calcium Checker HC
Category
Controllers
Build tier
Budget
Estimated price
$75
Tank fit range
best for systems 5 gallons and up
Format
Calcium Checker

Who it is for

Good fit for

  • ✓ Keepers who test this parameter on a schedule and want a numeric reading instead of color-matching.

Not a fit for

  • ✕ A first purchase before the heater, ATO, and maintenance routine are stable.

Listed features

  • Handheld colorimeter for marine calcium
  • Range 200-600 ppm, resolution 1 ppm
  • LED light source at 610 nm, +/-6% accuracy
  • Redesigned 100 uL mini-pipette for dosing reagent
  • 1 AAA battery, reagent included

Specs checked against bulkreefsupply.com.

Compatibility math

Build role

gear value = risk reduced + maintenance made easier + build fit

Example: Hanna Instruments HI758 Marine Calcium Checker HC belongs in the plan only if it solves a real stability or maintenance job.

ReefCrafter keeps optional upgrades behind core stability requirements.

Risk notes

  • Automation can add complexity if the basic heater, ATO, and maintenance plan are not already stable.

Professional fit context

  • Check probe support, controllable outlets, alerting, redundancy, and setup complexity.
  • Hanna Instruments HI758 Marine Calcium Checker HC best for systems 5 gallons and up; confirm that range against the final display volume, sump volume, and livestock plan.

Alternatives to compare

Full spec snapshot

Category
Controllers
Build tier
Budget
Estimated price
$75
Tank fit range
best for systems 5 gallons and up
Format
Calcium Checker

Related reading

Questions

What should I compare the Hanna Instruments HI758 Marine Calcium Checker HC against?

Hanna Instruments HI736 Marine Phosphorus Ultra Low Range (ppb) Checker HC (Budget-tier alternative in the same category); Hanna Instruments HI772 Marine Alkalinity (dKH) Checker HC (Budget-tier alternative in the same category); Hanna Instruments HI774 Marine Phosphate Ultra Low Range (ppm) Checker HC (Budget-tier alternative in the same category).

What range and accuracy does the Hanna Instruments HI758 Marine Calcium Checker HC list?

The retailer listing gives: Range 200-600 ppm, resolution 1 ppm; LED light source at 610 nm, +/-6% accuracy.

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