Size: 60 x 60 x 25mm (2.36" x 2.36" x 0.98") Construction: Glass fiber reinforced plastic. Impeller and housing PBT are UL 94V-0 rating. Precise ball bearing or sleeve bearing system. Operating Temperature: Sleeve bearing -10ºC to +70ºC Ball bearing -30ºC to +75ºC Insulation resistance: 10 meg Ohms min. at 500V DC (between frame and terminal) Dielectric strength: 5mA max. at 500 VAC 60Hz one minute (between frame and terminal) Function: Frequency generator or rotation detection signal option Weight: 75 grams