There is a slew of PAR meters availible , If you want to spend $500 or better that's cool, but I think budget PAR meters are worth a second look. Folks say "well, they are 3% to 5% off" . Most corals have a wide range of PAR requirements, 50-75, 75-100, 100-125 , etc. So, I don't think I will be buying a coral that needs 74.7 PAR . Keeping the coral within the industry standard PAR range PLUS keeping the water parameters optimum for it equals success. These budget meters easily fall within the recommended PAR range of corals. With that being said. tell me Mr. Opogee why yours is better.