Can the thermometer be used to check lake water temperatures? I'd like to use it in a fishing application. Understanding the effect water temperature has on Musky locations is arguably the most dynamic of successful Musky fishing.

I cannot imagine how you would use this instrument for checking lake water since it will only read the SURFACE temperature. It would be damaged if you submerged it and so would you if you went under with it in order to squeeze the trigger. It's an infrared beam that reflects off surfaces to take readings. Better take along a plain old thermometer, a weight and some fishing line (better yet, string). Years ago, that's how I did it. Tie a knot in the line every 5 feet and count the number of knots as you lower the thermometer to know at what depth you are measuring.

What size and type battery is used?

Regular 9-volt battery, one was included with mine and hasn't needed to be replaced yet.

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Rosewill RTMT13001 Infrared Thermometer

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Temperature Range: -58 - 716 degree F (-50 - 380 degree C)
Accuracy: +/- 2% or 35.6 degree F (2 degree C)
Distance Spot Ratio: 12:1
Emissivity: 0.95

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Practical and easy to use, the Rosewill RTMT13001 Infrared Thermometer is a great addition to your household tool collection. This gadget is powered by laser sight technology, and measures object temperature in an instant from -50°C~380°C (-58°F~716°F) with ±2% or 2°C accuracy and 0.1°C (0.1°F) step. Its large LCD screen with bright backlight shows legible realtime temperature information, and data hold function allows you to retain the measurement for later. Featuring long battery life and auto power off, this infrared thermometer lasts longer between charges.

Versatile Thermometer with Large LCD ScreenThe Rosewill RTMT13001 infrared thermometer is a great tool for detecting temperature of motherboard/video card, air condition outlet temperature and Auto engine temperature. With a large LCD screen, watch the temperature of objects in real time easily. Select °C or °F to suit your preference.
Convenient FeaturesThis model comes with several useful features like data hold function, laser target pointer selection and backlight display selection for optimized experience.
Ergonomic DesignPerfectly sized grip with finger grooves fits comfortably and securely in your hand.
Longer Battery LifeThis model features long battery life and auto power off to reduce the battery disposal for cost and environment savings.