The meter was designed with paranormal research in mind by Gary J. Galka of DAS Distribution and marketed through Pro Measure. The meter is named after Gary's eldest daughter Melissa who passed away in 2004.
Gary's intuitive approach to designing the meter shows heavily in its range of features and it's also great to see that development is ongoing as new ideas are incorporated into updated models.
Although technically NOT the only instrument on the market able to simultaneously monitor EMF and temperature (many data loggers can do so with a range of sensors), it is without doubt the first to do so at such a low cost. But as far as dedicated EMF meters go, this is a first! The cost together with the fact the meter satisfies many of the paranormal investigator's "wants" in a EMF meter, assures this will become one of the most popular units on the market.
The unit is rated to measure the EMF band from 30Hz to 300 Hz.
Most EMF meters including the the Mel-8704 and K-II meters monitor within this band but manufacturer specifications state the Mel-8704 will monitor between 30Hz-300Hz (the full SLF range), while the K-II is said to monitor upwards from 50Hz (mains power frequency). Experience shows that the K-II may respond to various other frequencies but attempts are made with the Mel-8704 to reduce "false positive" detections outside the stated range by grounding and shielding components.
The large backlit LCD display is a huge plus and whilst a momentary switch would be considered the norm, the manufacturer has used a permanent type so you can have the back light on as long as you need.
The unit also includes a burst mode for EMF measurement. This essentially changes the viewable sampling time of approximately once per second to around twenty times per second. This is achieved by utilizing all of the processors speed to keep the LCD refreshing, giving a super fast response not usually seen on digital meters. Although this is at the expense of simultaneous temperature measurement, this is a much welcomed addition.
In order to keep up with such a fast response another feature becomes useful. The unit can be set to record so it retains the maximum and minimum readings encountered. This may be used in normal (EMF and temp) or burst mode (EMF only), providing yet another highly desirable feature.