{"product_id":"itc-reefculture-parwise-par-spectrum-meter-reef","title":"ITC Reefculture PARwise | Digital PAR \u0026 Spectrum Meter for Reef Aquariums","description":"\u003cp\u003eThe \u003cstrong\u003eITC Reefculture PARwise\u003c\/strong\u003e is a hobbyist-grade PAR meter and spectrometer that ends the guesswork on reef lighting. Drop the cosine-corrected sensor in the tank, plug it into your phone or computer, and read PAR (PPFD), Kelvin (color temperature), LUX, Spectrum, DLI, Peak Wavelength, and Hue — all from a single tool. It is the same data points pros use to dial in coral growth and color, in a sub-$300 package.\u003c\/p\u003e\n\n\u003cp\u003ePair the PARwise with our \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/aquaillumination\"\u003eAquaIllumination lighting\u003c\/a\u003e, browse \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/water-testing\"\u003eWater Testing\u003c\/a\u003e instruments, or shop more \u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/equipment\"\u003eAquarium Equipment\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;\"\u003eWhat the PARwise Measures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePAR (PPFD)\u003c\/strong\u003e — photosynthetic photon flux density in µMol\/m²\/S, the key metric for coral \u0026amp; plant growth.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKelvin (CCT)\u003c\/strong\u003e — color temperature, so you can match aesthetic targets across fixtures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLUX\u003c\/strong\u003e — traditional brightness metric, useful for general-purpose readings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpectrum\u003c\/strong\u003e — full visible spectrum graph; see exactly which wavelengths your fixture is putting out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDLI (Daily Light Integral)\u003c\/strong\u003e — cumulative photon delivery over a photoperiod.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak Wavelength \u0026amp; Hue\u003c\/strong\u003e — fine-tune blues, whites, and reds for coral fluorescence and color pop.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;\"\u003eWhy Choose PARwise\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFraction of pro-meter cost\u003c\/strong\u003e with measurements typically reserved for $1,500+ lab instruments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnderwater \u0026amp; in-air\u003c\/strong\u003e use — a sealed sensor head with user-replaceable cosine corrector.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb app, no install\u003c\/strong\u003e — plug in via USB and the Chrome-based PARwise app loads automatically.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReal spectral data\u003c\/strong\u003e instead of a single-number summary, so you can compare LEDs, T5s, and metal halides apples-to-apples.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUSB-C adapter included\u003c\/strong\u003e for Android phones, tablets, and computers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;\"\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eThe PARwise runs on a web-based app served over USB. It works on Windows, macOS, and Android via Chrome browser. \u003cstrong\u003eIt does not work on iOS or iPadOS\u003c\/strong\u003e — Apple's USB restrictions prevent the connection. If you only have an iPhone or iPad, plan on borrowing an Android device or running it on a laptop.\u003c\/p\u003e\n\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;\"\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;background:#f7f7f7;width:40%;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003eITC Reefculture\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;background:#f7f7f7;\"\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003eDigital PAR meter + spectrometer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;background:#f7f7f7;\"\u003e\u003cstrong\u003eMetrics\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003ePAR (PPFD), Kelvin, LUX, Spectrum, DLI, Peak Wavelength, Hue\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;background:#f7f7f7;\"\u003e\u003cstrong\u003eSensor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003eCosine-corrected optical engine, user-replaceable corrector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;background:#f7f7f7;\"\u003e\u003cstrong\u003eConnection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003eUSB; USB-C adapter included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;background:#f7f7f7;\"\u003e\u003cstrong\u003eCompatible Devices\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003eWindows, macOS, Android (via Chrome). Not iOS \/ iPadOS.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;background:#f7f7f7;\"\u003e\u003cstrong\u003eUse\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003eUnderwater \u0026amp; in-air\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;background:#f7f7f7;\"\u003e\u003cstrong\u003eBest For\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px 10px;\"\u003eReef tanks, planted tanks, dialing in LED \/ T5 \/ hybrid fixtures\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;\"\u003eRecommended Pairings\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/aquailumination-212459-prime-16-hd-led-reef-light-white\"\u003eAI Prime 16 HD (White)\u003c\/a\u003e — nano-reef LED that benefits from PAR tuning.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/aquaillumination-hydra-32-hd-led-reef-light-white\"\u003eAI Hydra 32 HD (White)\u003c\/a\u003e — mid-size reef fixture; PARwise helps map shadowing.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/red-sea-reefled-g2-115-led-light-fixture\"\u003eRed Sea ReefLED G2 115\u003c\/a\u003e — verify PAR delivery at depth in larger systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/products\/maxspect-jump-mj-l230-led-light-nano-reef-saltwater\"\u003eMaxspect Jump MJ-L230\u003c\/a\u003e — nano LED that pairs well with PAR-mapped settings.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/squeakysaquatics.com\/collections\/water-testing\"\u003eWater Testing\u003c\/a\u003e — the rest of our test kit and instrument lineup.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3 style=\"margin:14px 0 4px;font-size:1.05em;font-weight:600;line-height:1.25;\"\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat PAR levels should I target?\u003c\/strong\u003e\u003cbr\u003eRough guidelines: low-light corals (mushrooms, zoas) 50–150 PAR; LPS 150–250; mixed reef 200–300; SPS 300–450+. Measure at the rock or sand surface, not at the water line.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy does spectrum matter, not just PAR?\u003c\/strong\u003e\u003cbr\u003eTwo fixtures can read the same PAR but produce different growth and color. Spectrum tells you whether you have enough blue (corals love 420–470nm) versus broad daylight.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it work on freshwater planted tanks?\u003c\/strong\u003e\u003cbr\u003eYes. PAR and spectrum readings are equally useful for planted-tank aquascapers tuning LED bars to plant species.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I leave it in the tank long-term?\u003c\/strong\u003e\u003cbr\u003eIt is intended for in-the-moment readings, not permanent deployment. Rinse with fresh water and dry after each saltwater dip.\u003c\/p\u003e","brand":"ITC","offers":[{"title":"Standard","offer_id":48330053320923,"sku":"ITC-PARWISE","price":279.99,"currency_code":"USD","in_stock":true},{"title":"Pro","offer_id":48330053353691,"sku":"ITC-PARWISEPRO","price":379.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/5209\/3403\/files\/image_d15a2576-69c8-45d2-8e92-566a37f2ca63.jpg?v=1772895989","url":"https:\/\/squeakysaquatics.com\/products\/itc-reefculture-parwise-par-spectrum-meter-reef","provider":"Squeaky's Aquatics","version":"1.0","type":"link"}