Diamond Beam II is a precision instrument. This is a top of the line model, featuring a strong NiMh battery for super fast recovery and warm-up and recharging with the adapter. The instrument also will accept standard non-rechargeable AAA alkaline batteries. Light emitting diodes on both sides for convenient use by right and left handed people. The special activated sensor will assist the positive identification of simulants and increased sensitivity while testing small stones and white sapphires. We take our work seriously and offer you 3 years manufacturers warranty.