Kanishka enterprises offers mini ligno wood moisture meter. With only two settings, it is easy to use [most of the common woods fall into the `3` setting], and the unit`s on/off switch is engaged when the pins are pushed into the wood to an acceptable depth. If you don`t get a reading, then you don`t have the pins pushed in far enough. Pull the pins out and the meter shuts off, so you won`t be wasting the battery. The pins are of a very good taper design allowing easy wood penetration. A second longer set of pins is stored inside the meter for taking measurements in thicker material the shape of the meter allows you to push behind the entire body to sink the pins. The meter read out is in a simple scale of 6-20 per cent moisture content so there is no need to convert the reading. While there is no calibration unit provided with this model, there is one offered by the company as an accessory. The mini-ligno is a nearly foolproof and accurate meter that is priced at a level that most wood workers can stomach for accuracy.