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Anaheim Scientific introduced the fourth model in its M-Series of mini-handheld environmental meters. The M140 – Mini Solar Power Meter can record watts per square meter with a range of 1,999. Accuracy is typically within ±10W/m2 or ±5%, whichever is greater in sunlight Other M-Series meters included the M110 Mini Light Meter, The M120 Mini Temperature/Humidity Meter, and the M130 Mini Anemometer. The M-Series meters have a large 3.75 digit display and weigh only 2.8 ounces. They also feature a data hold, maximum/average/minimum hold, zero adjustments, low-battery indicator, and auto power off and disable function.