Apogee Instruments has just announced the release of two new PAR meters: Underwater Quantium Flux MQ-210 and MQ-510.  The new meters function almost identically to the MQ-200 and MQ-500, but with the added feature of a built-in immersion correction factor. If you currently use a standard MQ-200 or MQ-500 meter, there is no reason to worry because those meters still both work great in aquarium applications. These new meters, however, will work even better, especially when their measurements are multiplied by the unit’s new immersion correction factor; it is described in length in the owner’s manual.  Apogee Instruments designed the MQ-210 and MQ-510 just to make PAR calculations a little easier on the aquarist.   The  company tells MORE